Lecture 18 Population genetics 3: Gene flow, non-random mating and natural selection

Question 1

Effects of non-random mating

Answer 1

Assortive and Disassortive

Question 1

Assortive

Answer 1

mating b/w similar individual in-breeding-> mating among related indviduals

Question 2

Disassortive

Answer 2

mating b/w different individuals outbreeding -> avoid making w/ related individuals.

Question 3

what happens to individuals that self-fertilize (plants )

Answer 3

the frequency of heterozygotes is lost

Question 4

What happens to heterozygous when dissimilar individuals breed?

Answer 4

Maintain all genotypes in your population and see an increase in heterozygote3

Question 5

Calculating proportion suriving

Answer 5

= Relative fitness * Initial frequency

Question 6

Calculating frequency after selection

Answer 6

proportion surviving/ total proportion surviving

Question 7

what is the relationship between increase of frequency in dominant and recessive alleles

Answer 7

increases only slightly when recessive allele is beneficial.
Increases a lot more when dominant allele is beneficial.

Question 8

Natural selection is phenotypic

Answer 8

So as recessive/ dominant alleles increase the heterozygote decrease drastically. If the dominant homozygous allele increase the recessive homozygous decreases to zero and the inverse will happen.