multiple choice questions chapter 16

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for most genes, a gene pool typically contains
a. none
b. one
c. two or more.
d. no more than two

two or more alleles

what type of natural selection takes place when individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle?
a. directional
b. stabilizing
c. destabilizing
d. disruptive

disruptive selection

a random change in allele frequency is called
a. fitness
b. genetic drift
c. speciation
d. founder effect

b. genetic drift

genetic drift is more likely to occur in
a. large populations
b. medium-sized populations
c. small populations
d. single individual

c. small populations

what occurs when allele frequencies change as a result of the migration of small subgroup of population?
a. directional selection
b. the founder effect
c. speciation
d. genetic equilibrium

b. the founder effect

what principle states that the frequency of an allele in a population will remain constant unless one or more factors cause that frequency to change
a.speciation principle
b. genetic equilibrium principle
c. the hardy-weinberg principle
d. the genetic-drift principle

c. hardy-weinberg principle

the situation in which allele frequencies do not change is called
a. genetic equilibrium
b. stabilizing equilibrium
c.behavioral equilibrium
d. directional selection

a. genetic equilibrium

which of the following is required to maintain genetic equilibrium?
a. the population must be small
b. no mutations occur
c. individuals move between populations
d. natural selection occurs

b. no mutations occur

what situation occurs when members of two different species cannot interbreed and produce fertile offspring?
a. reproductive isolation
b. genetic equilibrium
c. genetic drift
d. natural selection

a. reproductive isolation

what is the formation of a new species called?
a. directional selection
b. speciation
c. founder effect
d. temporal isolation

b. speciation

what kind of isolation occurs when two populations are capable of interbreeding but have difference in courtship rituals or other types of behavior?
a. courtship isolation
b. behavioral isolation
c. geographic isolation
d. temporal isolation

c. geographic isolation

two populations kept separate by a river are characterized by
a. genetic drift
b. behavioral isolation
c. geographic isolation
d. temporal isolation

c. geographic isolation

what situation occurs when two or more species reproduce at different times?
a. stabilizing selection
b. behavioral isolation
c. geographic isolation
d. temporal isolation

d. temporal isolation

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