Download Quiz: Monohybrid Cross

Quiz: Monohybrid Cross
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Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. A white mouse whose parents are both white produces only brown offspring when mated with a brown
mouse. The white mouse is most probably ____.
a. homozygous recessive
c. homozygous dominant
b. heterozygous
d. haploid
2. In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with
a single-combed hen. All of the chicks in the F1 generation were kept together as a group for several years.
They were allowed to mate only within their own group. What is the expected phenotype of the F2 chicks?
a. 100% rose comb
b. 75% rose comb and 25% single comb
c. 100% single comb
d. 50% rose comb and 50% single comb
3. In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a
silver-blue mink and 8 offspring are produced, how many would be expected to be silver-blue?
a. 0
c. 6
b. 3
d. 8
4.
What is the genotype of generation 1 in Figure 10-5?
a. II
c. ii
b. Ii
d. I
5. Which stage of meiosis is responsible for the law of independent assortment?
a. metaphase I
c. telophase I
b. prophase I
d. metaphase II
6. In mice, black is dominant to white color and color is determined by a single gene. Two black mice are
crossed. They produce 2 black offspring and one white offspring. If the white offspring is crossed with one of
its parents, what percent of the offspring are expected to be white?
a. 0
c. 50
b. 25
d. 75
Quiz: Monohybrid Cross
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7. Mendel crossed a true-breeding plant that produced green seeds with a true-breeding plant that produced
yellow seeds to produce an F1 generation. The entire F1 generation produced yellow seeds. Then he crossed
the F1 offspring with each other to produce the F2 generation. From the F2 generation, he counted 6022
yellow seeds. Which of these is the most likely estimate of the number of green seeds he collected from the
F2 generation?
a. 0
c. 6000
b. 2000
d. 18000
8. If two heterozygous individuals are crossed, what percent of their offspring are also expected to be
heterozygous?
a. 0
c. 75
b. 50
d. 100
In humans, having freckles (F) is dominant to not having freckles (f). The inheritance of these traits can be
studied using a Punnet square similar to the one shown below.
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9. 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.
____ 10. Refer to the illustration above. The parents shown in the Punnett square could have children with a phenotype
ratio of
a. 1:2:1.
c. 3:1.
b. 4:0.
d. 2:2.
____ 11. Refer to the illustration above. Which box in the Punnett square represents a child who does not have
freckles?
a. box 1
c. box 3
b. box 2
d. box 4
____ 12. Refer to the illustration above. The child in box 3 of the Punnett square has the genotype
a. FF.
c. ff.
Ff.
b.
d. None of the above
Quiz: Monohybrid Cross
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In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits.
____ 13. Refer to the illustration above. The device shown, which is used to determine the probable outcome of genetic
crosses, is called a
a. Mendelian box.
c. genetic graph.
b. Punnett square.
d. phenotypic paradox.
____ 14. Refer to the illustration above. Both of the parents in the cross are
a. black.
c. homozygous dominant.
b. brown.
d. homozygous recessive.
____ 15. Refer to the illustration above. The phenotype of the offspring indicated by box 3 would be
a. brown.
c. a mixture of brown and black.
b. black.
d. None of the above
____ 16. Refer to the illustration above. The genotypic ratio of the F1 generation would be
a. 1:1.
c. 1:3.
b. 3:1.
d. 1:2:1.
____ 17. What is the expected genotypic ratio resulting from a homozygous dominant  heterozygous monohybrid
cross?
a. 1:0
c. 1:2:1
b. 1:1
d. 1:3:1
____ 18. What is the expected genotypic ratio resulting from a heterozygous  heterozygous monohybrid cross?
a. 1:2:1
c. 1:2
b. 1:3:1
d. 1:0
____ 19. What is the expected phenotypic ratio resulting from a homozygous dominant  heterozygous monohybrid
cross?
a. 1:3:1
c. 2:1
b. 1:2:1
d. 1:0
____ 20. What is the probability that the offspring of a homozygous dominant individual and a homozygous recessive
individual will exhibit the dominant phenotype?
a. 0.25
c. 0.66
b. 0.5
d. 1.0
Quiz: Monohybrid Cross
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Quiz: Monohybrid Cross
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
A
B
A
B
A
6.
7.
8.
9.
10.
C
B
B
A
C
11.
12.
13.
14.
15.
D
B
B
A
B
16.
17.
18.
19.
20.
D
B
A
D
D
Quiz: Monohybrid Cross
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