Pages 482-483; 470-472

Question 1

gene flow

Answer 1

the movement of alleles between populations. Equalizes allele frequencies between the source population and recipient population.

Question 2

When alleles move from one population to another, the populations tend to

Answer 2

become more alike. Can also say that gene flow homogenizes allele frequencies among populations.

Question 3

If a population has lost alleles due to genetic drift

Answer 3

then the arrival of new alleles via gene flow should increase genetic diversity.

Question 4

Gene flow is random with respect to fitness

Answer 4

the arrival or departure of alleles can increase or decrease average fitness, depending on the situation.

Question 5

inbreeding

Answer 5

mating between relatives. Likely to share alleles they inherited from their common ancestor. increase homozygosity.

Question 6

Inbreeding itself does not cause evolution because

Answer 6

allele frequencies do not change in the population as a whole.

Question 7

Nonrandom mating changes only genotype frequencies

Answer 7

not allele frequencies, so it is not an evolutionary process itself.

Question 8

Inbreeding can speed the rate of evolutionary change

Answer 8

It increases the rate at which natural selection eliminates recessive deleterious alleles from a population.

Question 9

inbreeding depression

Answer 9

the decline in average fitness that takes place when homozygosity increases and heterozygosity decreases in a population. Results from two causes:
(1) Many recessive alleles represent loss-of-function mutations.

(2) Many genes are under intense selection for heterozygote advantage, a selection process that favors genetic diversity.

Question 10

sexual selection

Answer 10

nonrandom mating; females activate choose certain males and/or males compete among themselves to secure mates.