Practice Test 2 – PCB3063
Page 1 of 6
1.
Consider the following pedigree, which has individuals that are hypersensitive to UV radiation
indicated by solid black:
a.
What is the mode of inheritance for the gene that causes the hypersensitivity? (dominant
or recessive)
b.
What is the probability that individual 4 in generation III would have a hypersensitive
child if he married a woman that was hypersensitive?
c.
What is the probability that individual 6 in generation III would have a hypersensitive
child if she married a nonhypersensitive man who has a son from a previous
relationship that is hypersensitive? Explain your answer.
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Practice Test 2 – PCB3063
Page 2 of 6
2.
In a family of five children what is the probability that:
a)
all are males?
b)
three are males and two are females?
c)
two are males and three are females?
d)
all are of the same sex?
3.
The previous question referred to a human family. Would the probabilities you list above differ
if:
(you just need to state “same” or “different” for ‘a’ and ‘b’)
a)
you were considering the sexes of the young for a pair of birds that lay a clutch of five
eggs?
b)
you were considering the sexes of the young for a pair of turtles?
c)
Justify your answers to parts ‘a’ and ‘b’ of this question.
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 Spring '08
 MARTA

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