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Quiz 8
1.
You would like to produce a strain of wheat that has alleles for high gluten content by
artificially selecting for high gluten in an existing population. From which population
should you sample to maximize the likelihood that your new strain has alleles for high
gluten?
A.
Population with high gluten when grown with fertilizer, but low gluten when
grown in normal soil.
B.
Population that always has average gluten levels regardless of soil quality
C.
Population
that has
variable
gluten levels
(high
and low)
regardless
of
soil quality
D.
Population with low gluten levels regardless of soil quality.


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2.
What is the inbreeding coefficient (
F
) between first cousins (shown in the pedigree below)?
A. (1/2)
6
= 1/64 = 0.015625
B. 2*(1/2)
6
= 1/32 = 0.03125
C.
4*(1/2)
6
= 1/16 = 0.0625
D. 2*(1/2)
4
= 1/8 = 0.125
E. 2*(1/2)
3
= 1/4 = 0.25
3.
A species of mouse lives in a jungle. During one rainy season, a river forms through the
middle of the jungle. The river remains for many years. The animals on each side
randomly mate with each other, but they cannot mate with the animals on the other
side. What do you expect to happen to allele and genotype frequencies in the mouse
populations on either side of the river?
A.
Allele frequencies will differ between the populations on either side of the river,
and genotype frequencies will be out of Hardy-Weinberg equilibrium within each
population.
B.
Allele frequencies will differ between the populations on either side of the river,
and genotype frequencies will be in Hardy-Weinberg equilibrium within each
population.
C.
Allele frequencies will be the same between the populations on either side of the
river, and genotype frequencies will be out of Hardy-Weinberg equilibrium within
each population.
D.
Allele frequencies will be the same between the populations on either side of the
river, and genotype frequencies will be in Hardy-Weinberg equilibrium within
each population.
E.
Allele frequencies in one population will be the same as in the population before
the river formed.


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4.
Body color in a fish is controlled by one gene with two alleles. Homozygotes for one
allele and heterozygotes are bright red, whereas homozygotes for the other allele are
brown. You collect 100 individuals from a population and count 84 red individuals
and 16 brown individuals. Assuming that the population is in Hardy-Weinberg
equilibrium, what is the frequency of the recessive allele?
A. 0.08
B. 0.16
C.
0.40
D. 0.60
E. 0.84
5.
The brown fish from the previous question blend into the background and are less
likely to be eaten by predators than the red fish. Assuming the population mates at
random, if you came back in 5 generations and collected 100 more fish, what do you
expect to observe?
A.
The
recessive
allele
will
have
increased
in
frequency.
B.
The dominant allele will have increased in frequency.
C.
The allele frequencies will have not changed.
D.
The allele frequencies will have changed, but we cannot predict how.
E.
The genotype frequencies will no longer be Hardy-Weinberg equilibrium.