5/3/24 - Lecture 18: Population Genetics III: Gene Flow, Non-random Mating, & Natural Selection

Question 1

Nonrandom mating

Answer 1

When individuals choose mates with particular phenotypes or genotypes

Question 2

What are the types of nonrandom mating?

Answer 2

Assortative and disassortative mating

Question 3

Assortative mating

Answer 3

Mating between similar individuals

Can be inbreeding, which is mating among related individuals

Question 4

Disassortative mating

Answer 4

Mating between different individuals

Can be outbreeding, which is avoiding mating with related individuals

Question 5

What if each individual self-fertilizes/inbreeds?

Answer 5

Eventually the frequency of heterozygotes will approach zero.

This doesn’t change the allele frequencies, it changes the phenotypic frequencies.

Question 6

Inbreeding depression

Answer 6

When inbreeding exposes deleterious recessive alleles

Question 7

What happens when dissimilar individuals breed?

Answer 7

All genotypes in the population will be maintained and the frequency of heterozygotes will increase