HWE random mating

Positive assortment mating

individuals choose mates similar to themselves

Negative assortment mating

disassortative mating

individuals choose mates different from themselves

What does positive assortment mating cause?

an increase in homozygosity and decrease in heterozygosity

What does negative assortment mating cause?

increase in heterozygosity

Inbreeding

increases homozygosity at all loci

violates conclusion 2

what is the most extreme form inbreeding?

selfing

If all individuals self, homozygous parents produce?

homo. offspring

Heterozygous parents would produce…

half homozygous nd half heterozygous

Is conclusion 1 violated?

no, allele frequencies stay the same

If you inbreed with a distant relative, what happens?

homozygotes increase in population but slower

Coefficient of inbreeding: F= -1

signifies 100% heterozygotes

Coefficient of inbreeding: F=0

population is panmitic

Coefficient of inbreeding: F>0

some kind of inbreeding

Coefficient of inbreeding: F=0.5

population is selfing

Coefficient of inbreeding: F=1

entire population homozygotes (locus is fixed for one allele)

Factors of inbreeding depression

exposure of deleterious alleles as homozygotes

loss of function mutations are usually hidden as heterozygotes

increases frequency at which deleterious alleles affect phenotypes

How do plants nd animals avoid inbreeding depression?

mate choice

self- incompatability

dispersal

different phenologies of male nd female organs

Small populations cannot avoid inbreeding depression. This results in?

endangered species

Florida panther

population was reduced to very low number bc of hunting and habitat destruction. it was isolated

mutational meltdown+ inbreeding depression combined= extinction vortex

What happened after the extinction vortex?

new alleles introduced by artificial migration

genetic diversity started increasing