Free Printable life 120 unit 3

1.

For a diploid organism that normally has a total of 20 chromosomes, how many chromosomes will be present in a somatic cell after S phase?

a)

40

b)

20

c)

80

d)

10

2.

During which phase of mitosis do motor proteins pull chromosomes to opposite sides of the cell?

a)

metaphase

b)

prophase

c)

anaphase

d)

telophase

3.

During which phase of the cell cycle do chromosomes condense into discrete observable structures?

a)

prophase

b)

G2

c)

telophase

d)

G1

4.

Which of the following would result if a cell underwent DNA replication and mitosis without undergoing cytokinesis?

a)

one cell with two nuclei and two copies of the genome

b)

one cell with one nucleus and one copy of the genome

c)

one cell with one nucleus and two copies of the genome

d)

two cells, one with a nucleus and one without a nucleus

5.

For a cell that is heterozygous for a particular gene, during which phase of meiosis does the dominant allele separate from the recessive allele, assuming that no crossing over occurs?

a)

metaphase I of meiosis

b)

anaphase II of meiosis

c)

anaphase I of meiosis

d)

metaphase II of meiosis

6.

Independent assortment contributes to the genetic diversity of gametes by:

a)

influencing the combination of maternal and paternal chromosomes in each gamete

b)

influencing the number of chromosomes that will end up in each gamete

c)

exchanging DNA sequences between homologous chromosomes

d)

exchanging DNA sequences between sister chromatids

7.

For seed color: Y-Yellow (dominant), y-green (recessive). For seed shape: R-round (dominant), r-wrinkled (recessive). Assuming these genes are located on different chromosomes, what is the probability of a YyRr × Yyrr cross producing a plant with green, round seeds?

a)

1/8 = 0.13

b)

3/16 = 0.19

c)

1/4 = 0.25

d)

1/16 = 0.06

8.

In this pedigree, dark shapes indicate people affected by a disease caused by an autosomal allele. What is the inheritance pattern for this disease and the genotype of the mother?

a)

dominant, heterozygous

b)

recessive, heterozygous

c)

recessive, homozygous

d)

dominant, homozygous

9.

Assuming all three genes are located on different chromosomes, what is the probability of a AaBbCc × AabbCC cross producing an offspring with genotype aabbCC?

a)

1/16 = 0.06

b)

1/8 = 0.13

c)

1/32 = 0.03

d)

1/64 = 0.02

10.

Color-blindness is an X-linked recessive trait. A color-blind woman and a man with normal color vision find out that they are pregnant with a son. What is the probability that this son will be color blind?

a)

0.00

b)

0.50

c)

0.25

d)

1.00

11.

A single kidney cell is isolated from a human male. Assuming that no mutations have occurred, this cell would have:

the same DNA content as his sperm cells.

a)

true

b)

false

12.

A single kidney cell is isolated from a human male. Assuming that no mutations have occurred, this cell would have:

the same protein content as a cell in his heart.

a)

true

b)

false

13.

A single kidney cell is isolated from a human male. Assuming that no mutations have occurred, this cell would have:

DNA from each of his parents.

a)

true

b)

false

14.

A single kidney cell is isolated from a human male. Assuming that no mutations have occurred, this cell would have:

the same DNA content as a cell in his heart.

a)

true

b)

false

15.

Dog somatic cells have 78 chromosomes (2n = 78). Which of the following is true regarding the cell cycle of a dog liver cell?

During G1, this cell will have a total of 156 DNA double helices in its nucleus.

a)

true

b)

false

16.

Dog somatic cells have 78 chromosomes (2n = 78). Which of the following is true regarding the cell cycle of a dog liver cell?

If the cell enters the G0 phase, then it will not produce sister chromatids.

a)

true

b)

false

17.

Dog somatic cells have 78 chromosomes (2n = 78). Which of the following is true regarding the cell cycle of a dog liver cell?

If the cell undergoes mitosis and cytokinesis, then the two daughter cells will have 39 chromosomes each.

a)

true

b)

false

18.

Dog somatic cells have 78 chromosomes (2n = 78). Which of the following is true regarding the cell cycle of a dog liver cell?

During G2, this cell will have half as much DNA as during G1.

a)

true

b)

false

19.

Crossing over:

happens during metaphase I of meiosis.

a)

true

b)

false

20.

Crossing over:

rarely occurs in natural populations.

a)

true

b)

false

21.

Crossing over:

occurs between homologous chromosomes.

a)

true

b)

false

22.

Crossing over:

contributes to the genetic diversity of gametes.

a)

true

b)

false

23.

Which of the following describes a similarity between mitosis and meiosis I? They both:

begin with chromosomes that are duplicated

a)

true

b)

false

24.

Which of the following describes a similarity between mitosis and meiosis I? They both:

include the cytokinesis stage

a)

true

b)

false

25.

Which of the following describes a similarity between mitosis and meiosis I? They both:

produce two daughter cells

a)

true

b)

false

26.

Which of the following describes a similarity between mitosis and meiosis I? They both:

result in cells with reduced ploidy

a)

true

b)

false

27.

This karyotype was taken during metaphase of mitosis from a human skin cell. Which of the following is true regarding the structures enclosed by the box, assuming that no mutations have occurred?

Structure B results from the duplication of Structure A.

a)

true

b)

false

28.

This karyotype was taken during metaphase of mitosis from a human skin cell. Which of the following is true regarding the structures enclosed by the box, assuming that no mutations have occurred?

Structures A and B will pair during metaphase I of meiosis.

a)

true

b)

false

29.

This karyotype was taken during metaphase of mitosis from a human skin cell. Which of the following is true regarding the structures enclosed by the box, assuming that no mutations have occurred?

The box contains four DNA double helices.

a)

true

b)

false

30.

This karyotype was taken during metaphase of mitosis from a human skin cell. Which of the following is true regarding the structures enclosed by the box, assuming that no mutations have occurred?

Structures A and B represent homologous chromosomes.

a)

true

b)

false

31.

Assuming no mutations have occurred, which of the following have different DNA sequences?

sister chromatids

a)

true

b)

false

32.

Assuming no mutations have occurred, which of the following have different DNA sequences?

duplicated chromosomes

a)

true

b)

false

33.

Assuming no mutations have occurred, which of the following have different DNA sequences?

sex chromosomes

a)

true

b)

false

34.

Assuming no mutations have occurred, which of the following have different DNA sequences?

homologous chromosomes

a)

true

b)

false

35.

A cross between two true-breeding pea plants, one that has inflated pods and another that has constricted pods, produces F1 plants that all have inflated pods. These F1 plants are self-crossed to produce an F2 generation in which 75% of plants have inflated pods and 25% of plants have constricted pods. What could you conclude about this experiment?

All of the F2 plants with inflated pods have the same genotype.

a)

true

b)

false

36.

A cross between two true-breeding pea plants, one that has inflated pods and another that has constricted pods, produces F1 plants that all have inflated pods. These F1 plants are self-crossed to produce an F2 generation in which 75% of plants have inflated pods and 25% of plants have constricted pods. What could you conclude about this experiment?

The fact that there are only two pod shapes in the F2 generation suggests that pod shape follows an incomplete dominance pattern.

a)

true

b)

false

37.

A cross between two true-breeding pea plants, one that has inflated pods and another that has constricted pods, produces F1 plants that all have inflated pods. These F1 plants are self-crossed to produce an F2 generation in which 75% of plants have inflated pods and 25% of plants have constricted pods. What could you conclude about this experiment?

All of the F2 plants with constricted pods have the same genotype.

a)

true

b)

false

38.

A cross between two true-breeding pea plants, one that has inflated pods and another that has constricted pods, produces F1 plants that all have inflated pods. These F1 plants are self-crossed to produce an F2 generation in which 75% of plants have inflated pods and 25% of plants have constricted pods. What could you conclude about this experiment?

Inflated pod shape is recessive to constricted pod shape.

a)

true

b)

false

39.

You learn about a disease that is recessively inherited based on a single gene with two alleles. The D allele codes for an enzyme that is important for removing waste products from brain cells. How might the d allele be different such that it causes the disease? The d allele could:

lead to the gene being absent from brain cells

a)

true

b)

false

40.

You learn about a disease that is recessively inherited based on a single gene with two alleles. The D allele codes for an enzyme that is important for removing waste products from brain cells. How might the d allele be different such that it causes the disease? The d allele could:

produce an enzyme that does not fold properly

a)

true

b)

false

41.

You learn about a disease that is recessively inherited based on a single gene with two alleles. The D allele codes for an enzyme that is important for removing waste products from brain cells. How might the d allele be different such that it causes the disease? The d allele could:

lead to the enzyme having a different structure in its active site

a)

true

b)

false

42.

You learn about a disease that is recessively inherited based on a single gene with two alleles. The D allele codes for an enzyme that is important for removing waste products from brain cells. How might the d allele be different such that it causes the disease? The d allele could:

lead to the enzyme not being produced in brain cells

a)

true

b)

false

43.

Which of the following is an example of polygenic inheritance?

A person with AB blood type has both A and B alleles.

a)

true

b)

false

44.

Which of the following is an example of polygenic inheritance?

An animal’s life expectancy is determined by several genes.

a)

true

b)

false

45.

Which of the following is an example of polygenic inheritance?

Genes on both autosomal and sex chromosomes influence a cat’s coat color.

a)

true

b)

false

46.

Which of the following is an example of polygenic inheritance?

A gene associated with a metabolic disorder also affects hair and finger nail growth.

a)

true

b)

false

47.

Which of the following contributes to a genetic disease being maintained in a human population?

The disease can be easily treated with dietary modifications.

a)

true

b)

false

48.

Which of the following contributes to a genetic disease being maintained in a human population?

The disease prevents a person from producing offspring.

a)

true

b)

false

49.

Which of the following contributes to a genetic disease being maintained in a human population?

The disease allele helps a person resist a local parasite.

a)

true

b)

false

50.

Which of the following contributes to a genetic disease being maintained in a human population?

The disease only occurs very late in life.

a)

true

b)

false

51.

A parental AABB × aabb cross produces an F1 organism with an AaBb genotype. These two genes are located right next to each other on the same chromosome, so assume that no crossover can occur between the two genes. Which gametes could be produced by the F1 organism?

Bb

a)

true

b)

false

52.

A parental AABB × aabb cross produces an F1 organism with an AaBb genotype. These two genes are located right next to each other on the same chromosome, so assume that no crossover can occur between the two genes. Which gametes could be produced by the F1 organism?

Ab

a)

true

b)

false

53.

A parental AABB × aabb cross produces an F1 organism with an AaBb genotype. These two genes are located right next to each other on the same chromosome, so assume that no crossover can occur between the two genes. Which gametes could be produced by the F1 organism?

AA

a)

true

b)

false

54.

A parental AABB × aabb cross produces an F1 organism with an AaBb genotype. These two genes are located right next to each other on the same chromosome, so assume that no crossover can occur between the two genes. Which gametes could be produced by the F1 organism?

ab

a)

true

b)

false

55.

Genes A and B have a 30% recombination frequency. Genes C and D have a 10% recombination frequency. Which of the following can you conclude from this information?

Genes A and C are likely located on the same chromosome.

a)

true

b)

false

56.

Genes A and B have a 30% recombination frequency. Genes C and D have a 10% recombination frequency. Which of the following can you conclude from this information?

Genes C and D likely code for proteins involved in the same cellular process.

a)

true

b)

false

57.

Genes A and B have a 30% recombination frequency. Genes C and D have a 10% recombination frequency. Which of the following can you conclude from this information?

The distance between genes A and B is likely less than between genes C and D.

a)

true

b)

false

58.

Genes A and B have a 30% recombination frequency. Genes C and D have a 10% recombination frequency. Which of the following can you conclude from this information?

Genes and C and D are likely located on the same chromosome.

a)

true

b)

false

59.

Which of the following describes the correct order of the phases of mitosis?

a)

anaphase – prometaphase – metaphase – prophase – telophase

b)

prophase – prometaphase – metaphase – anaphase – telophase

c)

prophase – metaphase – prometaphase – telophase – anaphase

d)

telophase – prometaphase – metaphase – prophase – anaphase

60.

Microtubules grow with their + ends pointing away from centrosomes. Which motor protein combination at the positions indicated on the figure would enable chromosomes to be pulled toward the centrosome?

a)

A: + end directed, B: - end directed

b)

A: + end directed, B: + end directed

c)

A: - end directed, B: + end directed

d)

A: - end directed, B: - end directed

61.

What would result from a cell that completes mitosis, but does not complete cytokinesis?

a)

one cell with one nucleus containing half of the genetic material of the parent cell

b)

two cells, each cell with half of the genetic material of the parent cell

c)

one cell with two nuclei, each identical to the nucleus of the parent cell

d)

two cells, one cell containing two nuclei and a second cell without a nucleus

62.

Which of the following does not occur during an animal life cycle?

a)

unicellular haploid stage

b)

unicellular diploid stage

c)

multicellular diploid stage

d)

multicellular haploid stage

63.

Which of the following structures mediates the interaction between chromosomes and microtubules?

a)

kinetochores

b)

synaptonemal complexes

c)

centromeres

d)

telomeres

64.

For pea plant flower color, the P-purple allele is dominant over the p-white allele. A cross between two heterozygous purple flowers would be expected to produce:

a)

2 purple: 2 white

b)

3 purple: 1 white

c)

4 purple: 0 white

d)

1 purple: 3 white

65.

A test cross is used to determine:

a)

whether recombination has occurred between two genes

b)

the genotype of an organism displaying a dominant phenotype

c)

the relative distance between two genes located on one chromosome

d)

whether a particular allele acts in a dominant fashion

66.

If an organism with the genotype AaBbCC is crossed with organism with the genotype AABBCc, what is the probability of an offspring having the genotype AABBCC, assuming that these genes are all located on different chromosomes?

a)

0.06

b)

0.12

c)

0.25

d)

0.50

67.

Which of the following represents a codominant mode of inheritance?

a)

individuals that carry both the A and B alleles have AB blood type

b)

human height is affected by many different genes

c)

multiple different mutations in the PS1 gene can cause familial Alzheimer’s disease

d)

a cross between a plant with green peas and a plant with yellow peas produces only plants with green peas

68.

The sickle cell disease allele causes irregularly shaped red blood cells by coding for a hemoglobin protein that:

a)

cannot be expressed in blood cells

b)

tends to aggregate

c)

binds oxygen too tightly

d)

cannot bind to oxygen

69.

Which of the following describes the DNA content of human somatic cells?

they contain 23 homologous chromosome pairs

a)

true

b)

false

70.

Which of the following describes the DNA content of human somatic cells?

they contain 46 total chromosomes

a)

true

b)

false

71.

Which of the following describes the DNA content of human somatic cells?

different somatic tissues in an organism have different DNA sequences

a)

true

b)

false

72.

Which of the following describes the DNA content of human somatic cells?

they are haploid during part of the cell cycle

a)

true

b)

false

73.

Which of the following occurs before, during, or as a result of mitosis?

sister chromatids separate from each other during anaphase

a)

true

b)

false

74.

Which of the following occurs before, during, or as a result of mitosis?

homologous chromosomes pair with each other at the metaphase plate

a)

true

b)

false

75.

Which of the following occurs before, during, or as a result of mitosis?

chromosomes condense during prophase

a)

true

b)

false

76.

Which of the following occurs before, during, or as a result of mitosis?

a parent cell divides into two genetically identical daughter cells

a)

true

b)

false

77.

Eukaryotic chromosomes consist of the following macromolecules.

phospholipids

a)

true

b)

false

78.

Eukaryotic chromosomes consist of the following macromolecules.

DNA

a)

true

b)

false

79.

Eukaryotic chromosomes consist of the following macromolecules.

proteins

a)

true

b)

false

80.

Eukaryotic chromosomes consist of the following macromolecules.

RNA

a)

true

b)

false

81.

Which of the following reduces the ploidy of a cell?

meiosis I

a)

true

b)

false

82.

Which of the following reduces the ploidy of a cell?

meiosis II

a)

true

b)

false

83.

Which of the following reduces the ploidy of a cell?

mitosis

a)

true

b)

false

84.

Which of the following reduces the ploidy of a cell?

fertilization

a)

true

b)

false

85.

Which of the following are said to have identical sequences?

X and Y sex chromosomes

a)

true

b)

false

86.

Which of the following are said to have identical sequences?

homologous chromosomes

a)

true

b)

false

87.

Which of the following are said to have identical sequences?

sister chromatids

a)

true

b)

false

88.

Which of the following are said to have identical sequences?

duplicated chromosomes

a)

true

b)

false

89.

The image shows a homologous chromosome pair taken from a human cell during metaphase of mitosis. Which of the following describe the content of this image?

the image contains a total of two DNA double helices

a)

true

b)

false

90.

The image shows a homologous chromosome pair taken from a human cell during metaphase of mitosis. Which of the following describe the content of this image?

the two homologous chromosomes have different alleles

a)

true

b)

false

91.

The image shows a homologous chromosome pair taken from a human cell during metaphase of mitosis. Which of the following describe the content of this image?

the image contains only one duplicated chromosomes

a)

true

b)

false

92.

Which of the following describe the process of meiosis?

the cell undergoes two rounds of DNA replication

a)

true

b)

false

93.

Which of the following describe the process of meiosis?

homologous chromosomes pair during metaphase of meiosis I

a)

true

b)

false

94.

Which of the following describe the process of meiosis?

a parent cell divides into four genetically identical daughter cells.

a)

true

b)

false

95.

homologous chromosomes pair during metaphase of meiosis II

a)

true

b)

false

96.

Which of the following describes the chromosome number that can result from a particular nondisjunction event? Nondisjunction during:

meiosis II can produce a zygote with two copies of that chromosome

a)

true

b)

false

97.

Which of the following describes the chromosome number that can result from a particular nondisjunction event? Nondisjunction during:

meiosis I can produce a zygote with two copies of that chromosome

a)

true

b)

false

98.

Which of the following describes the chromosome number that can result from a particular nondisjunction event? Nondisjunction during:

meiosis I can produce a zygote with only one copy of that chromosome

a)

true

b)

false

99.

Which of the following describes the chromosome number that can result from a particular nondisjunction event? Nondisjunction during:

meiosis II can produce a zygote with three copies of that chromosome

a)

true

b)

false

100.

Two true-breeding organisms are crossed, producing an F1 generation with 100% of one phenotype and an F2 generation with a 3:1 phenotype ratio. This finding would be consistent with which of the following inheritance patterns?

complete dominance

a)

true

b)

false

101.

Two true-breeding organisms are crossed, producing an F1 generation with 100% of one phenotype and an F2 generation with a 3:1 phenotype ratio. This finding would be consistent with which of the following inheritance patterns?

codominance

a)

true

b)

false

102.

Two true-breeding organisms are crossed, producing an F1 generation with 100% of one phenotype and an F2 generation with a 3:1 phenotype ratio. This finding would be consistent with which of the following inheritance patterns?

incomplete dominance

a)

true

b)

false

103.

Two true-breeding organisms are crossed, producing an F1 generation with 100% of one phenotype and an F2 generation with a 3:1 phenotype ratio. This finding would be consistent with which of the following inheritance patterns?

blending hypothesis

a)

true

b)

false

104.

Which of the following is true regarding the occurrence of a disease allele that follows a recessive inheritance pattern?

this allele likely arose from a mutation caused by inbreeding

a)

true

b)

false

105.

Which of the following is true regarding the occurrence of a disease allele that follows a recessive inheritance pattern?

two unaffected individuals can have affected offspring

a)

true

b)

false

106.

Which of the following is true regarding the occurrence of a disease allele that follows a recessive inheritance pattern?

affected individuals will always have affected parents

a)

true

b)

false

107.

Which of the following is true regarding the occurrence of a disease allele that follows a recessive inheritance pattern?

two affected individuals will have all affected offspring

a)

true

b)

false

108.

Which of the following inheritance patterns could produce the pedigree shown?

autosomal dominant

a)

true

b)

false

109.

Which of the following inheritance patterns could produce the pedigree shown?

autosomal recessive

a)

true

b)

false

110.

Which of the following inheritance patterns could produce the pedigree shown?

X-linked recessive

a)

true

b)

false

111.

Which of the following inheritance patterns could produce the pedigree shown?

X-linked dominant

a)

true

b)

false

112.

Duchenne muscular dystrophy is caused by a recessive allele of the dystrophin gene, which is located on the X chromosome. Women who are carriers of the disease allele do not develop the disease. Which of the following describes this disease?

the daughters of a female carrier and an affected male will have a 50% chance of having the disease

a)

true

b)

false

113.

Duchenne muscular dystrophy is caused by a recessive allele of the dystrophin gene, which is located on the X chromosome. Women who are carriers of the disease allele do not develop the disease. Which of the following describes this disease?

the daughters of affected men will always have the disease

a)

true

b)

false

114.

Duchenne muscular dystrophy is caused by a recessive allele of the dystrophin gene, which is located on the X chromosome. Women who are carriers of the disease allele do not develop the disease. Which of the following describes this disease?

the sons of female carriers will have a 50% chance of having the disease

a)

true

b)

false

115.

Duchenne muscular dystrophy is caused by a recessive allele of the dystrophin gene, which is located on the X chromosome. Women who are carriers of the disease allele do not develop the disease. Which of the following describes this disease?

the sons of affected woman will always have the disease

a)

true

b)

false

116.

A single skin cell in a human female has: (Select all)

a)

DNA from her biological mother and father

b)

different DNA content than her liver cells

c)

different protein content than her liver cells

d)

different DNA content than her egg cells

117.

Which of the following is true regarding the cell cycle of a human skin cell? (Select all)

a)

The cell has 46 pairs of sister chromatids in the G1 phase.

b)

The cell contains more DNA during the G2 phase than the G1 phase

c)

A cell that stays in G0 never develops sister chromatids.

d)

After mitosis and cytokinesis, the two new skin cells have 23 chromosomes each.

118.

The diagram below shows a microtubule coupled to kinesin motor proteins, which are anchored to a glass slide. Which of the following will occur when these plus-end directed motor proteins become active?

a)

the motor proteins will move to the right

b)

the motor proteins will move to the left

c)

the microtubule will move to the right

d)

the microtubule will move to the left

119.

In order for chromosomes to be pulled apart, which motor protein must be located at the respective positions?

a)

A: kinesin, B: dynein

b)

A: kinesin, B: kinesin

c)

A: dynein, B: kinesin

d)

A: dynein, B: dynein

120.

What will happen to the fluorescent and bleached regions of the microtubules if chromosomes are both “reeled in” and “walked in” by motor proteins? Assume microtubules depolymerize on both ends. (Select all)

a)

region A will shorten

b)

region B will move to the left

c)

region C will shorten

d)

region C will lengthen

121.

This karyotype was taken during metaphase of mitosis. Which of the following is true regarding the structures enclosed by the box? (Select all)

a)

the box contains a total of two DNA double helices

b)

the box contains only one duplicated chromosome

c)

the box contains homologous chromosomes

d)

structures A and B will pair during metaphase of mitosis

122.

Which of the following are said to have identical DNA sequences? (Select all)

a)

homologous chromosomes

b)

duplicated chromosomes

c)

sister chromatids

d)

X and Y chromosomes

123.

Which of the following describe how ploidy changes for a cell? (Select all)

a)

DNA replication takes a diploid cell and turns it into a tetraploid cell.

b)

mitosis takes a diploid parent cell and makes two diploid daughter cells.

c)

a cell that has only one version from each homologous chromosome pair would be haploid.

d)

the fusion of two haploid cells would result in a diploid cell.

124.

Which of the following correctly describes homologous chromosomes? (Select all)

a)

they have all the same genes

b)

they contain different alleles

c)

they result from DNA replication during S phase

d)

they come from different parents

125.

Which of the following apply to both mitosis and meiosis in humans: (Select all)

a)

Both processes can occur in somatic cells.

b)

DNA replication happens only once for each process.

c)

Homologous chromosomes pair together during metaphase of each process.

d)

Both processes produce haploid daughter cells.

126.

Which of the following are true regarding chromosomes that result from normal crossing over? The chromosomes resulting from crossing over will: (Select all)

a)

have a different overall sequence than either of the parental chromosomes

b)

create new genes not present on parental chromosomes

c)

have new combinations of different alleles

d)

continue to be considered homologous chromosomes

127.

Which of the following are implications of Mendel’s experiment? (Select all)

a)

The finding of purple flowers in the F1 generation contradicted the blending hypothesis.

b)

The finding of white flowers in the F2 generation supported the particulate hypothesis.

c)

The finding that the F2 generation had a purple:white ratio that was slightly different than 3:1 suggests that a mistake had been made.

d)

This experiment provides definitive evidence that a cross between a purple and white flower will always produce all purple flowers.

128.

The segregation of alleles in gamete formation has its basis in which of the following phase of cell division (ignore crossing over)?

a)

prophase I of meiosis

b)

anaphase I of meiosis

c)

metaphase II of meiosis

d)

anaphase II of meiosis

129.

What phenotype ratio would result from a cross between a Pp flower and a pp flower?

a)

4 purple: 0 white

b)

3 purple: 1 white

c)

2 purple: 2 white

d)

1 purple: 3 white

130.

The flower color gene in snow peas has two alleles: P-Purple and p-white. The P allele codes for a protein that synthesizes purple pigment. How might the p allele be different such that it leads to white flowers? The p-allele could: (Select all)

a)

produce a protein that cannot make pigment

b)

lead to the gene being absent from flower cells

c)

produce a protein that makes too much pigment

d)

lead to the protein being absent from flower cells

131.

An RRYy plant is crossed with an RrYy plant. Assuming that these genes are located on different chromosomes, what is the probability of obtaining a RrYy plant?

a)

0.50

b)

0.25

c)

0.12

d)

0.06

132.

A father with AB blood type has a child with A blood type. Which of the following genotypes are possible for the mother of the child? (Select all)

a)

AA

b)

AB

c)

BB

d)

BO

133.

Pleiotropy occurs when a single gene affects multiple different characters. Which of the following is an example of pleiotropy? (Select all)

a)

a cross between red and white snapdragons produces pink snapdragons

b)

the ABO blood type system has more than two possible alleles for one gene

c)

skin color is determined by alleles for several different genes

d)

the gene that causes sickle cell disease can also affect malaria susceptibility

134.

Which of the following is true regarding this disease pedigree? (Select all)

a)

the alleles that causes the disease is dominant

b)

female A could be homozygous for the disease allele

c)

male B could be a carrier of the disease allele

d)

the next offspring produced by couple C has a 50% chance of being affected by the disease

135.

A daisy population has two alleles of a gene for petal color. One allele (A1) represents 90% of the alleles in the population, while the other allele (A2) represents 10% of the alleles in the population. Which of the following is likely true regarding the inheritance pattern of these alleles?

a)

A1 is dominant

b)

A1 is recessive

c)

A1 and A2 are codominant

d)

impossible to determine

136.

Which of the following “rules” apply to the inheritance of X-linked recessive traits? (Select all)

a)

affected females will always have affected daughters

b)

affected females will always have affected sons

c)

affected males will always have affected daughters

d)

affected males will always have affected sons

137.

Which of the following are likely to result from a cross between an orange female cat and a black male cat? (Select all)

a)

an orange female

b)

a black male

c)

a female with orange and black patches

d)

a male with orange and black patches

life 120 unit 3

Total questions: 137

Worksheet time: 1hrs 13mins

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