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Bio305
Genetics Exam II,
Fall 2004
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21. The Hopi, Zuni, and some other Southwest American Indians have a relatively high frequency of
albinism resulting from homozygosity for a autosomal recessive allele,
a
.
A normally pigmented man
and a normally pigmented woman, each of whom has one albino parent, have two children.
What is
the probability that at least one of the two children is albino?
ANSWER:
The probability that a child is not albino is ¾.
The probability that neither child is albino is (3/4)(3/4)=9/16.
The probability that at least one child is albino is 1(9/16)=7/16.
22. From the F2 generation of a cross between mouse genotypes AA
×
aa
, one male progeny of
genotype A
−
named LAZY was chosen and mated with an
aa
female.
All of the progeny in the
resulting litter were A
−
.
From this result, can you reject the null hypothesis that LAZY’s genotype is
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This note was uploaded on 12/12/2010 for the course BIOL 305 taught by Professor Zhang during the Fall '10 term at University of Michigan.
 Fall '10
 ZHANG
 Genetics

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