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ANIMAL SCIENCE 221
2
nd
Prelim
APRIL, 2002 
ANSWER KEY
1. In a population, the frequency of allele
A
at an autosomal locus
is .8 in males
and .5 in females. The population is then randomly mated for one generation.
(1 pt)
What is the frequency of
A
in the progeny?
f(A)  (.8 + .5)/2  .65
(1 pt)
After this first generation of random mating, is the population in equilibrium?
No
2. In a population, the frequency of
A
at a sexlinked locus
is different in males and
females. This difference is .3. The population is randomly mated for one generation.
(1 pt)
After this one generation of random mating, what is the difference expected to be
for the frequency of
A
in the male and in the female progeny?
3. In a population, the frequency of allele
B
is .7 and of allele
b
is .3. The mutation
rate of
B
to
b
is .00001 and of
b
to
B
is .00002.
(1 pt)
In the next generation, will the frequency of
B
be greater than, equal to, or less
than .7?
up = .00001 x .7 = .000007
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 Spring '07
 POLLAK,EJ

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