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WorksheetsGenetics Test Review 22
Total questions: 79
Worksheet time: 3hrs 35mins
If a trait shows up more commonly in men than women, then which of the following is most likely true?
The trait is not inherited genetically.
The gene is located on the x chromosome and the trait is dominant.
The gene is located on the x chromosome and the trait is recessive.
The gene is located on an autosome and the trait is dominant.
Which genotype represents a female who is a carrier for hemophilia?
Which genotype represents a male with hemophilia?
In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X R Y ?
male with white eyes
female with white eyes
male with red eyes
female with red eyes
Which chromosome contains more genes?
The X chromosome
The Y chromosome
They are homologous, so they contain the same amount of genes.
We do not know this information.
Males can be heterozygous for x-linked recessive traits.
True
False
Color blindness affects approximately 1 in 12 men and 1 in 200 women. Which statement best supports this difference in phenotype based on sex?
Color blindness is an X-linked recessive trait that is passed down from father to son. Since many men are affected, there are more sons being born who are affected.
Color blindness is a Y-linked recessive trait that is passed down from father to son. Since the Y chromosome is smaller, the gene makes a larger phenotypic impact.
Color blindness is an X-linked recessive trait. Since men only inherit 1 X chromosome, one recessive allele is all that is needed to make men colorblind whereas women would require two.
Color blindness is an X-linked dominant trait. Since men only inherit 1 X chromosome, the dominant allele is more likely to make men color blind than women, who inherit two X chromosomes.
A human male will normally transmit the genes
on his X chromosome to
his sons
his daughters
half of his sons and half of his daughters
all of his children
What type of inheritance is determined by multiple genes located at different loci on different chromosomes and there can be a range of traits?
Codominance
Incomplete dominance
Polygenic traits
Multiple Alleles
Pleiotropy
How many alleles (letters) does each person inherit for a gene?
1
2
3
4
Suppose the skin tone is determined by three genes: A, B, and C. Of the following, which genotype would most likely result in an individual with a medium-colored skin tone?
AabbCC
AABBcc
AaBbcc
Aabbcc
B = Black, b = Chocolate. Some labs inherit black or brown fur alleles but have light fur. This graphic shows an example of...
Codominance
Epistasis
Mendelian Dominance
Polygenic inheritance
Pleiotropy
A person has the following genotype for the three genes which control height. HHeeFf. What type of inheritance pattern is being discussed in this example?
co-dominant
incomplete dominant
polygenic traits
multiple alleles
pleiotropy
An interaction where one gene masks another gene is called:
Polygenic Traits
Epistasis
Multiple alleles
Codominance
B = Black, b = Chocolate. ee = no pigment
What is the phenotype of a dog that is Bbee?
Black
Chocolate
Yellow Lab
Red lab
According to a person's genotype, they should have brown hair; however, this individual has also inherited a a gene that makes them unable to grow hair on their head. What type of inheritance pattern is discussed in this example?
co-dominant
incomplete dominant
epistasis
polygenic traits
A baby dragon receives two dominant alleles which code for dark green skin; however, they also receive two recessive alleles for another gene that makes the dragon unable to produce pigment. What type of inheritance pattern would be seen with this example?
co-dominant
incomplete dominant
epistasis
polygenic traits
Pleiotropy
Examples include skin color and height (the individual's phenotype exists somewhere along a spectrum)
polygenic inheritance
multiple alleles
linked genes
incomplete dominance
pleiotropy
In addition to being an example of multiple alleles, blood type demonstrates another pattern of inheritance. Specifically, AB blood type is an example of what type of inheritance?
complete dominance
incomplete dominance
codominance
polygenic inheritance
If more than 2 alleles exist for a particular gene, this inheritance pattern would be...
multiple genes
multiple alleles
codominance
polygenic traits
pleiotropy
If a persons genotype was AABbCc for height. How many genes do they have for this trait?
6
3
4
5
A single gene has 3 or more alternative forms. These are called
heterozygotes
multiple alleles
epistatic
polygenic
Epistasis is the interaction between_____________ genes.
2
4
3
16
Labrador retriever's fur color is an example of epistasis. In this case the E gene controls the expression of the B gene. It a puppy was born with the genotype eeBB its fur color would be ________ and if it was born with the genotype EEbb it would be __________
yellow, yellow
yellow, black
chocolate, black
yellow, chocolate
In humans, the inheritance of the homozygous recessive genotype of a particular gene inhibits this ability to produce any pigment, resulting in very pale or light colors skin, eyes, and hair. Besides polygenics what other pattern of inheritance is this an example of?
Pleiotropy
Epistasis
Multiple alleles
Codominance
The different forms of a gene are known as _____________.
Gene types
Proteins
Alleles
Nucleotides
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
Cross a black fowl with a white fowl. What is the phenotype ratio?
1 : 0 : 0
1: 1: 0
0: 1: 0
0 : 1 : 1
In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (r) flowers make speckled flowers (Rr) that show both colors.
Complete a cross between 2 speckled flowers and find the genotype ratio.
0 : 1 : 0
1 : 1 : 0
1 : 2 : 1
0 : 1 : 1
Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?
75% hairy stems: 25% hairless stems
100% hairy stems
100% hairless stems
50% hairy stems: 50% hairless stems
In peas, round is dominant to wrinkled and yellow is dominant to green. Based on this dihybrid cross, what is the probability that the offspring will have wrinkled, yellow seeds?
9/16
3/16
1/16
16/16
This type of inheritance pattern is a blended mixture of two versions of a trait.
incomplete dominance
co-dominance
complete dominance
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).
What is the genotype ratio for a cross between a grey fowl and a white fowl?
1: 1: 0
0: 1: 0
0: 1: 1
1: 2: 1
Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (rr). What color are flowers that are Rr?
Red
Red and White
White
Pink
How many alleles would be in a genotype for a trait that is determined by one gene?
1
2
3
4
Condition in which both alleles for a gene are expressed when present - both versions of a trait are visible.
Codominance
Dominance
Complete dominance
Incomplete dominance
What is the chance that offspring from the cross AaBB x Aabb will be heterozygous for both traits?
1/16
1/4
1/2
3/16
The letters on the TOP AND SIDE of a punnett square represent ______________.
The combination of alleles in offspring.
The possible alleles present in parent gametes following meiosis.
The genotype and phenotype of offspring.
The probability of offspring inheriting a particular allele.
How many alleles per gene are inherited from one gamete?
1
2
23
46
Determine the possible gametes that could come from a parent with the genotype AABb.
aB, ab, AB, Ab
Ab, AB, Ab, AB
AB, AB, Ab, AB
Ab, AB, ab, aB
In guinea pigs Black fur (B) is dominant to white(b). Cross a white guinea pig with a heterozygous black guinea pig and determine genotypic ratio of the cross.
1:1
0:1:1
1:2:1
1:1:0
In pea plants Tall stems (T)are dominant to short stems (t). Cross a homozygous tall plant with a homozygous recessive plant, and report the phenotypic ratio of the cross.
1:0
1:1:0
1:0:0
0:1:1
What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds (Y)?
RrYy
RRyy
RRYy
rryy
A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.
Which option matches the genotypes of the mice in this cross?
BBEE x bbee
BBEe x BbEe
BbEE x BbEe
BBee x BBEE
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
3/16
1/4
1/2
3/4
When genes are closer together on a chromosome, they have a higher chance of being inherited together and will not be separated through meiosis. These genes are:
linked genes
codominant
F2 generation
on separate chromosomes
Crossing organisms from the F1 generation produces the _____ generation.
F2
P
F1
F1 hybrid
Gregor Mendel's "P" Generation consisted of plants which were ______________.
Purebred/true-breeding
Hybrid
Heterozygous
Incompletely Dominant
What does it mean for a trait to be "purebred" or true-breeding (select all that apply).
To have two of the same alleles
To have different alleles
If left to self-pollinate or if crossed with an individual identical for the genotype, the offspring would be identical to the parent(s) for this genotype.
If left to self-pollinate or if crossed with an individual identical for the genotype, the offspring would be genetically different from the parent(s) for this genotype.
In pea plants tall is dominant (T) over short plants (t), and green is dominant (G) over yellow (g). Cross a tall green pea plant (TtGg) with a short yellow pea plant (ttgg).
What is the phenotypic ratio of the cross?
1: 2: 2: 1
9: 3: 3: 1
1: 1: 1: 1
3: 3: 3: 3
What is the genotypic ratio of a monohybrid Mendelian F1 generation? Type only the ratio; do not include spaces after the colons.
(a)
What is the phenotypic ratio of a Mendelian F2 generation from a dihybrid cross? Type only the ratio; do not include spaces between numbers/colons.
(a)
What is the phenotypic ratio of a monohybrid Mendelian F2 generation? Type only the ratio; do not include spaces in between numbers/colons.
(a)
What is the genotypic ratio of an incompletely dominant monohybrid F2 generation? Type only the ratio; do not include spaces in between the numbers/colons.
(a)
What is the phenotypic ratio of a co-dominant monohybrid F2 generation? Type only the ratio; do not include spaces between the numbers/colons.
(a)
After performing a testcross, some of the resulting offspring demonstrate the recessive phenotype. What does this mean about the unknown dominant phenotype parent?
The unknown parent could be homozygous dominant or heterozygous.
The unknown parent is heterozygous.
The unknown parent is homozygous dominant.
The unknown parent is homozygous recessive.
Suppose a parent has the genotype HhBbRR. Which of the following are possible gametes that could be made from this parent? Select all that apply.
HhBbRR
HBR
hbR
HBr
In peas, round is dominant to wrinkled and yellow is dominant to green. What is the phenotypic ratio of this cross?
1:1:1:1
9:3:3:1
6:2:0:0
16:0:0:0
In peas, round is dominant to wrinkled and yellow is dominant to green. In terms of Mendel's experiments, this cross most likely represents...
The production of the F1 generation from the P generation.
The production of the F2 generation from the F1 generation.
The cross between individuals in the F2 generation.
The production of the F2 generation from the P generation.
Which statement identifies a difference between a genetics experiment involving Mendelian traits vs. a genetics experiment involving codominant or incompletely dominant traits?
Codominance and incomplete dominance will give rise to heterozygotes with a different phenotype than either homozygous phenotype.
Codominant and incompletely dominant traits will follow the same predicted outcomes as Mendelian traits.
The P generation of codominant and incompletely dominant trait experiments will not be purebred/true-breeding.
The F1 generation of codominant and incompletely dominant trait experiments will not be heterozygous.
