Genetics Test – Level
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Multiple Choice - Identify the choice that best completes the statement or answers the question.
____
1. Meiosis plays a more significant role in reproduction than mitosis in which of the following?
a. increasing the process of asexual reproduction.
b. more efficiently using energy in the cell division process
c. more rapidly reproducing and growing
d. increasing the variability of genetic information
____
2. The Punnett square above shows a cross between a homozygous dominant genotype for hair color and a
heterozygous genotype for hair color. Which conclusion can be drawn from the Punnett square above?
a. The parents will have four offspring.
b. Two of the offspring will be homozygous recessive.
c. Only two of the offspring will have the same hair color.
d. All of the offspring will have the same hair color.
____
3. When crossing-over takes place in meiosis, chromosomes
a. mutate in the first division.
b. exchange corresponding segments of DNA.
c. decrease in number.
d. produce new genes.
____
4. What determines the traits of an organism?
a. relation of AT to CG base pairs
b. number of nitrogen bases in RNA
c. presence of deoxyribose in a nucleic acid
d. sequence of nitrogen bases in DNA
____
5. In short-horned cattle, the alleles for color are red (R) and white (W) but neither is fully dominant over the other
(co-dominance). When a red bull is crossed with a white cow, the possible phenotypes of their offspring are:
a. red hair, white hair, and a mixture of both red and white hair.
b. a mixture of both red and white hair
c. pink hair
d. red hair
____
6. Which choice represents a dihybrid cross?
a. Sb x sB
b. RRYy x RrYY
c. XhXh x XHXh
d. XY x XX
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____
7. The technique known as chromosome painting is the result of scientific research. Scientists use chromosome
painting to mark the locations of genes on human chromosomes with fluorescent tags. It is also possible to
apply this technique to the chromosomes of many different species. Chromosome painting allows for which of
the following?
a.
b.
c.
d.
A comparison of the genomes of different species
The sequencing of proteins from many species
An increase in mutations in many species
The extraction of amino acids from different species
____ 8. In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a
brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic
ratios can be expected?
a.
b.
c.
d.
____
2 BB: 0 Bb: 2 bb
1 BB: 2 Bb: 1 bb
0 BB: 2 Bb: 2 bb
2 BB: 1 Bb: 0 bb
9. Mendel’s Law of Independent Assortment can be demonstrated using a
a. monohybrid cross.
b. dihybrid cross.
____
c. test cross.
d. pedigree.
10. In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r). A heterozygous
guinea pig and a homozygous recessive guinea pig are mated. Which of the following would be the phenotypes
of the offspring?
a.
b.
all rough coat
all smooth coat
c.
d.
2 rough coat and 2 smooth coat
3 rough coat and 1 smooth coat
____ 11. An individual heterozygous for a trait and an individual homozygous recessive for the trait are crossed and
produce many offspring that are
a. all the same genotype.
b. of two different phenotypes.
c. of three different phenotypes.
d. all the same phenotype.
____ 12. 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?
a. T
b. TT
c. Tt
d. tt
____ 13. The law of segregation states that
a. alleles of a gene separate from each other during meiosis.
b. different alleles of a gene can never be found in the same organism.
c. each gene of an organism ends up in a different gamete.
d. each gene is found on a different molecule of DNA.
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In humans, having freckles (F) is dominant to not having freckles (f). The inheritance of these traits can be
studied using a Punnett square similar to the one shown below.
____ 14. Refer to the illustration above. The child represented in box 1 in the Punnett square would
a. be homozygous for freckles.
c. be heterozygous for freckles.
b. have an extra freckles chromosome.
d. not have freckles.
In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits.
____ 15. Refer to the illustration above. Both of the parents in the cross are
a. black.
c. homozygous dominant.
b. brown.
d. homozygous recessive.
____ 16. Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which
components of DNA are referred to as the genetic code?
a.
b.
c.
d.
Phosphate groups
Nitrogenous bases
Deoxyribose sugars
Hydrogen bonds
____ 17. A color blind man (XbY) marries a woman who is not colorblind, but she is a carrier (XBXb). The possible
genotypes of their sons are:
a. XBXb, XBXb
c. XbY, XbY
b b
B b
b. X Y , X Y
d. XbY, XBY
____ 18. What would be the blood type of a person who inherited an A allele from one parent and an O allele from the
other?
a. type A
c. type AB
b. type B
d. type O
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____ 19. A man with hemophilia (XhY) marries a woman who does not carry hemophilia, but she is a carrier (XHXh).
Which of the following describes hemophilia?
a. multiple-allele trait
b. dominant trait
c. sex-linked trait
d. codominant trait
____ 20. Hair color, eye color and height are controlled by several genes. What type of inheritance are these traits an
example of?
a.
b.
c.
d.
multiple alleles
co-dominance
incomplete dominance
polygenic
____ 21. There are three different alleles that control blood type. What type of inheritance is blood type an example of?
a.
b.
c.
d.
multiple alleles
co-dominance
incomplete dominance
polygenic
____ 22. The illustration below shows:
a.
b.
c.
d.
A pedigree of a male with Downs syndrome
A karyotype of a female with Klinefelter syndrome
A karyotype of a male with Downs syndrome
A pedigree of a male with Klinefelter syndrome
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____ 23. Refer to the illustration below. How many males in Generation II are affected with sickle cell anemia?
a. 1
c. 3
b. 2
d. 4
____ 24. Refer to the illustration above. Which of the following represents the genotype of offspring Ttrr?
a. heterozygous tall, homozygous wrinkled
b. heterozygous short, homozygous wrinkled
c. heterozygous short, homozygous round
d. homozygous tall, homozygous wrinkled
____ 25. Refer to the illustration above. What are the genotypes of the parents in this cross?
a. TTRr and ttRr
b. TtRr and TtRr
c. TTrr and TtRr
d. TTRr and TtRr
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Genetics Test - Level
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
D
D
B
D
B
B
A
C
B
C
B
C
A
A
A
B
D
A
C
D
A
C
A
A
B
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