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WorksheetsS2 Biology Test 1: CH12 Genetics
Total questions: 66
Worksheet time: 33mins
What was Mendel's first conclusion?
An individual’s characteristics are determined by genes- factors that are passed down through generations.
An individual’s characteristics are determined by personality- factors that are gained through life.
Principle of Dominance: states that some alleles are dominant while others are recessive.
Law of independent assortment: When genes for different traits segregate independently during formation of gametes (one gene is not dependent on another).
What was Mendel's Second conclusion?
An individual’s characteristics are determined by genes- factors that are passed down through generations.
An individual’s characteristics are determined by personality- factors that are gained through life.
Principle of Dominance: states that some alleles are dominant while others are recessive.
Law of independent assortment: When genes for different traits segregate independently during formation of gametes (one gene is not dependent on another).
What was Mendel's Third conclusion?
An individual’s characteristics are determined by genes- factors that are passed down through generations.
Law of segregation: states that organisms inherit two copies of each gene and donate one copy to each of their offspring.
Principle of Dominance: states that some alleles are dominant while others are recessive.
Law of independent assortment: When genes for different traits segregate independently during formation of gametes (one gene is not dependent on another).
Which law states what happens during gamete formation, in which the alleles for each gene segregate from each other, so that each gamete carries only one allele for each gene. Ex. Happens through the process of meiosis
An individual’s characteristics are determined by genes- factors that are passed down through generations.
Law of segregation: states that organisms inherit two copies of each gene and donate one copy to each of their offspring.
Principle of Dominance: states that some alleles are dominant while others are recessive.
Law of independent assortment: When genes for different traits segregate independently during formation of gametes (one gene is not dependent on another).
The Scientific study of inheritance is called Genetics. Who was the Austrian Scientist priest born in 1822 who worked with ordinary garden peas to propose a model system to learn about inheritance of species.
Gregor Mendel
Albert Einstein
Charles Darwin
Michael Jackson
Mendel worked with pea plants, which are usually___________________ When he transferred pollen from one pea plant to another, he was _______________ the pea plants to ________________ the eggs and form embryos within a seed.
self-pollinating, cross-pollinating, fertilize
cross-pollinating, self-pollinating, fertilize
self-pollinating, cross-pollinating, segregate
*Mendel studied seven traits in pea plants. One of the monohybrid crosses he made was between plants with round seeds and plants with wrinkled seeds. What was a conclusion Mendel drew from the F1 generation of this cross?
The dominant factor, or allele, is for round seeds.
The dominant factor, or allele, is for wrinkled seeds.
The factors or alleles for round seeds disappear completely from the plants.
The factors or alleles for wrinkled seeds disappear completely from the plants.
A geneticist crossed pure breeding black mice (BB) with pure breeding brown mice (bb). All the mice in the F1 generation had black coats. When these mice were crossed, they yielded 961 black-coated mice and 317 brown-coated mice. The Punnett square describes this cross. The numbers 1 to 4 are shown instead of the genotypes for the offspring. Which of the genotypes, if any, is MOST likely to occur in the F2 generation?
BB
Bb
bb
All are eqaully likely
A geneticist crossed homozygous, dominant green pod color pea plants (GG) with homozygous recessive yellow pod color pea plants (gg). All the plants in the F1 generation had green pods.
What ratio of green pod color plants to yellow pod color plants would you predict when you cross a green pod color F1 plant with a yellow pod color plant?
Three-quarters of the plants will have a green pod color and one quarter will have a yellow pod color.
All of the plants will have a green pod color.
Half of the plants will have a green pod color, and half of the plants will have a yellow pod color.
All of the plants will have a yellow pod color.
In a cross of purple flowered heterozygous plants (Pp), the letter P represents the allele for purple flowers and the letter p represents the allele for white flowers. What is the probability that an offspring of this cross expresses plants with purple flower phenotypes?
0
1/4 or 25%
1/2 or 50%
3/4 or 75%
In tomatoes, red fruit (R) is dominant over yellow fruit (r). What is the probability that plants that are heterozygous (Rr) produce offspring with the homozygous (rr) genotype?
0
1/4 or 25%
1/2 or 50%
3/4 or 75%
In pea plants carry, height is determined by an allele for tallness (T) that is dominant over an allele for shortness (t). What is the probability that a gamete, selected at random, would carry the short allele in a cross of heterozygous tall pea plants (Tt x Tt)?
1/8 or 12.5%
1/4 or 25%
1/2 or 50%
3/4 or 75%
In a certain plant, the allele for red flower color (R) is dominant over the allele for white flower color (r). A cross is performed between a plant with red flowers and a plant with white flowers. The offspring are 47 plants with red flowers and 51 plants with white flowers.
What are the genotypes of the parent plants?
The results are close to a 1:1 ratio of plants with red flowers to plants with white flowers. Therefore, the genotypes of the parents are Rr and rr.
The results should yield plants with red flowers and plants with white flowers in a 3:1 ratio, so the genotypes of both parents are Rr. The number of offspring was not large enough to produce the expected results.
The results differ from the predicted values. Therefore, the genotypes of the parents cannot be determined.
The results should show a ratio of 3 plants with white flowers to 1 plant with red flowers, so the genotypes of the parent plants are RR and rr.
Study the Punnett square, which shows a dihybrid cross of round, yellow peas. (RrYy x RrYy). If all 16 genotypes shown in the Punnett square are equally likely, which statement can be concluded?
The gene for pea shape expresses incomplete dominance over the gene for pea color.
The gene for pea shape is codominant with the gene for pea color.
The gene for pea shape is linked to the gene for pea color.
The gene for pea shape sorts independently of the gene for pea color.
In horses, black coat (B) is dominant over brown coat (b) and trotter (T) is dominant over the recessive allele pacer (t).
A dihybrid cross is conducted for these two traits. Which combination of traits is likely to appear in the offspring with a probability of 1/16?
black coat, trotter
black coat, pacer
brown coat, trotter
brown coat, pacer
This Punnett square shows flower color inheritance in snapdragons. What is the expected ratio of red flowers to pink flowers to white flowers in the F2 generation? HINt: Incomplete dominance
1 red: 2 pink: 1 white
9 red: 3 pink: 1 white
4 red: 1 white
all pink
*A genetic trait that appears in every generation of offspring is called ____.
dominant.
superior.
phenotypic.
recessive.
*When roan cattle are mated, 25% of the offspring are black, 50% are roan, and 25% are white. Upon examination, it can be seen that the coat of a roan cow consists of both black and white hairs. This trait is one controlled by _____.
codominant alleles
polygenic inheritance
multsex-linked genesiple alleles
*A trait controlled by four alleles is said to have _____.
Hint: ABC, ABc, AbC, aBc etc
multiple alleles
hybridization
autosomes
homologous alleles
*In humans, eye color and height are controlled by
polygenic inheritance.
complete dominance.
co-dominance
incomplete dominance.
*Mendel used what type of pea plants in his first experiments?
purebreeding
hybrids
self-breeding
heterozygous plants
*An allele that is always expressed whenever it is present is called
dominant
superior
recessive
phenotypic
*Garden peas are good subjects for studying heredity because they
are difficult to grow.
produce few offspring.
they are easy to grow and produce many offspring
have few traits.
*When several genes affect a character it is called a?
trait
polygenic character
character
genetic disorder
*Which of the following is not an outcome of the environment modifying a phenotype?
the increased intelligence of a person who attended school for many years
the pink-flowered snapdragons that result from crosses between red-flowered and white-flowered snapdragon plants
the changing of the color of an animal’s fur as the temperature changes
the very short stature of a kind of tree that grows at a high altitude in comparison with the same kind of tree growing at a lower altitude
*What is the likelihood an event will occur?
chance
statistics
probability
outcome
*All of the offspring resulting from a cross between a red snapdragon and a white snap dragon are pink. What is the possible explanation for this?
incomplete dominance.
polygenic inheritance.
codominance
multiple alleles
*What is the name of a group of offspring from a given group of parents?
generation
children
group
family
*Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder?
25%
50%
75%
100%
*In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits. Both of the parents in the cross are:
black
brown
homozygous dominant.
homozygous recessive.
*In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits. The phenotype of the offspring indicated by box 3 would be:
HINT: This is complete dominance
black
brown
a mixture of brown and black.
white
*In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits. The device shown, which is used to determine the probable outcome of genetic crosses, is called a:
Punnett square.
Mendelian box.
phenotypic paradox.
genetic graph.
*Mendel’s law of segregation states that
pairs of alleles are dependent on one another when separation occurs during gamete formation.
pairs of alleles separate independently of one another after gamete formation.
the two alleles for a trait segregate independently when gametes are formed.
each pair of alleles remains together when gametes are formed.
**The 23rd pair of chromosomes that differ in males and females are called Sex chromosomes. Combinations for males is XY and combinations for females is XX
True
False
*Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness?
Tt
TT
tt
T
Tallness (T) is dominant to shortness (t) in pea plants. Which of the following represents a genotype of a pea plant that is homozygous for tallness?
Tt
TT
tt
T
*What is a monohybrid cross?
a cross between two traits
a cross between several traits.
a cross between multiple traits
a cross between one trait
What is a dihybrid cross?
a cross between two traits
a cross between several traits.
a cross between multiple traits
a cross between one trait
*What would be the blood type of a person who inherited an A allele from one parent and an O allele from the other?
type A
type B
type AB
type O
*If an individual possesses two recessive alleles for the same trait, the individual is said to be
haploid for the trait.
heterozygous for the trait.
homozygous for the trait.
mutated.
*Genes located on homologous chromosomes may have alternate forms that control different forms of a trait. These alternate forms of a gene are called _____.
alleles
centromeres
phenotypes
gametes
*Which event occurs in meiosis, but not mitosis?
Crossing- over occurs
The parent cell divides to form genetically-identical daughter cells.
Separated chromatids move to opposite ends of the cell.
All chromosomes align along the center of the cell.
*If Drosophila fruit fly have four chromosomes, how many sperm cells are formed from an original cell at the conclusion of meiosis?
two haploid sperm cells
two diploid sperm cells
four haploid sperm cells
four diploid sperm cells
*What is the result of crossing over?
Enables nonhomologous chromosomes to come closer to each other.
It prevents genotypes of certain species from mixing together.
It allows for genetic diversity
It does not have any effect on the phenotype of the offspring
*What stage in meiosis involves a pair of homologous chromosomes moving to the equator?
Metaphase I
Metaphase II
Anaphase I
Anaphase II
*Meiosis takes place in what type of cells?
skin cells
nerve cells
blood cells
reproductive cells
*______ is the first cell formed after fertilization.
embryo
blastocyst
meiosis
zygote
*The process shown is _____.
mitosis
chromosomal mutation
meiosis
dominance
*In a certain flower, orange flower color occurs in the heterozygous (Rr) offspring of red (RR) and yellow (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 orange:1 yellow?
orange x orange
red x yellow
yellow x orange
red x orange
*Mrs. Delgado is blood type AO and Mr. Delgado is blood type ____ They have three children named Marie, Valentina, and Camila. Valentina is type B, Marie is type A and Camila is type AB. What is Mr. Delgado's genotype?
AA blood
BO blood
OO
*What is the genotype of the individual in the punnett square above?
TtBb
TTBB
TTbb
ttbb
*What is the phenotype of the unknown individual?
Tall and Black
Tall and White
Short and Black
Short and White
*What is the phenotypic ratio of the above punnet square?
HINT: this a dihybrid cross between two heterozygous genotypes for both traits
1:3:3:1
9:3:3:1
1:2:2:4:1:2:1:2:1
9:3:3:2
Identify a:
Anaphase II
Anaphase I
Metaphase II
Prophase II
Identify b:
Anaphase II
Telophase II
Metaphase II
Prophase II
Identify c:
Anaphase I
Telophase I
Metaphase I
Prophase I
Identify d:
Anaphase I
Telophase I
Metaphase I
Prophase I
Identify e:
Anaphase I
Telophase I
Metaphase I
Prophase I
Identify h:
Anaphase I
Telophase I
Metaphase I
Prophase I
Identify f:
Anaphase II
Telophase II
Metaphase II
Prophase II
Identify g:
Anaphase II
Telophase II
Metaphase II
Prophase II
*Which element does NOT have an atmospheric reservoire?
phosphorous
carbon
hydrogen
nitrogen
*What are the two processes that keep the carbon cycle going?
photosynthesis and cellular respiration
mitosis and meiosis
gametophyte and sporophyte
*Long chains of amino acids are found in _____.
proteins
lipids
sugars
carbohydrates.
*During photosynthesis, carbon dioxide and _____ are converted through a series of reactions into two products: high-energy _____ and _____ gas.
water; glucose; oxygen
glucose; water; oxygen
water; oxygen; glucose
oxygen; water; glucose
*The light independent reactions take place in the _____.
stroma
thylakoid
mitochondria
golgi apparatus
