BSC 1005 Chapter 9 Practice Test questions with
verified answers
A male with an X-linked recessive disorder mates with a female who is a
carrier for this same X-linked recessive disorder. Which of these is the
correct expected frequency of this disorder in their children?
A) 50% frequency in the sons
B) 50% frequency in the daughters
C) 50% frequency in both the sons and the daughters
D) 100% frequency in the sons
E) 100% frequency in the daughters Ans✓✓✓ 50% frequency in both
the sons and the daughters
A plant with pink flowers is allowed to self-pollinate. Generation after
generation, it produces pink flowers. This is an example of:
A) allopolyploidy.
B) incomplete dominance.
C) the law of independent assortment.
,D) a true-breeding plant.
E) interbreeding. Ans✓✓✓ a true-breeding plant
A situation in which the heterozygote offspring of two homozygotes
shows a phenotype intermediate between those of the parents is
called:
A) a test-cross.
B) polygenic traits.
C) multiple allelism.
D) incomplete dominance.
E) pleiotropy. Ans✓✓✓ incomplete dominance
A true-breeding pigmented male giraffe (MM) is bred with a pigmented
heterozygous female(Mm). What are the possible genotypic ratios of
this cross?
A) 2 MM: 1 Mm: 1 mm
, B) 1 MM: 2 Mm: 1 mm
C) 2 MM: 0 Mm: 2 mm
D) 2 MM: 2 Mm: 0 mm
E) 0 MM: 2 Mm: 2 mm Ans✓✓✓ 2 MM: 2Mm: 0mm
A true-breeding, purple-flowered pea plant is repeatedly mated with a
true-breeding, white-flowered pea plant. All of their offspring are
purple-flowered. If two of these purple-flowered offspring are mated,
what percentage of their offspring will be white-flowered?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100% Ans✓✓✓ 25%
All genetically normal humans have:
verified answers
A male with an X-linked recessive disorder mates with a female who is a
carrier for this same X-linked recessive disorder. Which of these is the
correct expected frequency of this disorder in their children?
A) 50% frequency in the sons
B) 50% frequency in the daughters
C) 50% frequency in both the sons and the daughters
D) 100% frequency in the sons
E) 100% frequency in the daughters Ans✓✓✓ 50% frequency in both
the sons and the daughters
A plant with pink flowers is allowed to self-pollinate. Generation after
generation, it produces pink flowers. This is an example of:
A) allopolyploidy.
B) incomplete dominance.
C) the law of independent assortment.
,D) a true-breeding plant.
E) interbreeding. Ans✓✓✓ a true-breeding plant
A situation in which the heterozygote offspring of two homozygotes
shows a phenotype intermediate between those of the parents is
called:
A) a test-cross.
B) polygenic traits.
C) multiple allelism.
D) incomplete dominance.
E) pleiotropy. Ans✓✓✓ incomplete dominance
A true-breeding pigmented male giraffe (MM) is bred with a pigmented
heterozygous female(Mm). What are the possible genotypic ratios of
this cross?
A) 2 MM: 1 Mm: 1 mm
, B) 1 MM: 2 Mm: 1 mm
C) 2 MM: 0 Mm: 2 mm
D) 2 MM: 2 Mm: 0 mm
E) 0 MM: 2 Mm: 2 mm Ans✓✓✓ 2 MM: 2Mm: 0mm
A true-breeding, purple-flowered pea plant is repeatedly mated with a
true-breeding, white-flowered pea plant. All of their offspring are
purple-flowered. If two of these purple-flowered offspring are mated,
what percentage of their offspring will be white-flowered?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100% Ans✓✓✓ 25%
All genetically normal humans have:
