Chapter 16:
Population Genetics
Practice Test
1.
What is migration between adjacent gene pools?
a.
genetic drift
b.
inbreeding
c.
population bottleneck
d.
gene flow
Hint
2.
Which of these statements is consistent with the Hardy-Weinberg model?
a.
Under simple circumstances, with no evolutionary forces operating, genetic variation tends to decrease in populations.
b.
Under simple circumstances, with no evolutionary forces operating, genetic variation tends to remain in populations.
c.
Evolutionary forces such as migration and mutation have little effect on small populations of organims.
d.
Random sampling always results in the same pairs of gametes being chosen to produce zygotes over and over in a population.
Hint
3.
If a breeder wanted larger chickens, which of these pairs would he allow to breed?
a.
large hen, small rooster
b.
small hen, small rooster
c.
small hen, large rooster
d.
large hen, large rooster
Hint
4.
What is a model that geneticists use to understand how gene pools work?
a.
the Haldane-Wright model
b.
the Hardy-Fisher model
c.
the Hardy-Weinberg model
d.
the Haldane-Fisher model
Hint
5.
What causes a reduction in survival and fertility in a population as compared to populations that do not suffer from this condition?
a.
inbreeding depression
b.
artificial selection
c.
population bottleneck
d.
founder effect
Hint
6.
What is random change in allele frequencies in a population?
a.
genetic drift
b.
population bottleneck
c.
gene flow
d.
inbreeding
Hint
7.
What are relatives that arise from a single fertilized egg?
a.
identical twins
b.
fraternal twins
c.
inbred
d.
cell cultures
Hint
8.
How many base pairs does the human genome contain?
a.
about 165 million
b.
about 3 million
c.
about 6 million
d.
about 3 billion
Hint
9.
Why is the allele for sickle-cell anemia still frequent in certain regions of Africa?
a.
because sickled blood cells are resistant to sleeping sickness
b.
because only homozygotes are resistant to sickle-cell anemia
c.
because sickled blood cells are resistant to malaria
d.
because only heterozygotes have sickle-cell anemia
Hint
10.
What are the genes that affect quantitative traits, such as size of butterfly wings?
a.
inbred trait loci
b.
qualitative trait loci
c.
mutations
d.
quantitative trait loci
Hint
