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Question 2: Briefly answer the questions below.
a. In guinea pigs, black coat color (B) is dominant over
white coat color (b). When a true breeding black guinea pig
is crossed to a true breeding white guinea pig, what is the
probability that their progeny will be black? Explain.
b. If two heterozygous black guinea pigs are crossed, what
fraction of their progeny will be black? Explain.
c. Lack of pigmentation (albinism) in humans is the result
of a recessive allele (a), and normal pigmentation is the
result of its dominant allele (A). Two normal parents have
an albino child. Determine the probability that the next
child is albino. Explain.
d.The genotypes of two individuals in a tetrahybrid cross
are AABbCCDd and AabbccDD. What fraction of their
offspring would be heterozygous for all four traits?
(Assume independent assortment for all four traits, and
show your calculations.)
e. A man of blood group B is being sued by a woman of
blood group A for paternity. The womans child is blood
group O. Can this man be the father of this child? Explain.
Question 3
State the distribution (in terms of expected percentages) of
eye color among the male and female offspring derived
from each of the following crosses considering the
following:
In the fruit fly, red eye color R is dominant over white eye
color r; and the gene for eye color is on the X
chromosome.
a. White-eyed female and red-eyed male.
b. Heterozygous red-eyed female and red-eyed male.
c. Homozygous red-eyed female and white-eyed male.
d. Heterozygous red-eyed female and white-eyed male.
e. White-eyed female and white-eyed male
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Solution
Question 2:
a. In guinea pigs, black coat color (B) is dominant over
white coat color (b). When a true breeding black guinea pig
is crossed to a true breeding white guinea pig, what is the
probability that their progeny will be black? Explain.
b. If two heterozygous black guinea pigs are crossed, what
fraction of their progeny will be black? Explain.
c. Lack of pigmentation (albinism) in humans is the result
of a recessive allele (a), and normal pigmentation is the
result of its dominant allele (A). Two normal parents have
an albino child. Determine the probability that the next
child is albino. Explain.
d.The genotypes of two individuals
http://www.chegg.com/homework-help/expertquestion in a
tetrahybrid cross are AABbCCDd and AabbccDD. What
fraction of their offspring would be heterozygous for all
four traits? (Assume independent assortment for all four
traits, and show your calculations.)
e. A man of blood group B is being sued by a woman of
blood group A for paternity. The womans child is blood
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group O. Can this man be the father of this child? Explain.
BBbBbBbbBbBb

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