EE BIOL 185 Lecture Notes - Lecture 14: Allele Frequency, Heterozygote Advantage, Genetic Drift

• School: UCLA
• Department: Ecology and Evolutionary Biology
• Course: EE BIOL 185
• Professor: Pamela Yeh

Document Summary

Positive relationship: the more alleles that are mutant the more cases of typhoid. Mutant alleles appear to be maintained due to heterozygote advantage. Popgen practice problem: you have a 1 locus, 2 allele system. Nonrandom mating is not an evolutionary force: can affect genotypic frequencies though. Migration: violations of hwe: 100%a1: no diversity. Locus fixed for a1: migration: move form mainland to island, final allele frequency becomes 80%-20% Water snakes: range from being banded to unbanded. In order of how far they are from mainland. Get more and more unbanded as you go farther. More gene flow, the similar the populations are. Early age: if everyone was colonized by one source, might look similar. But if multiple sources, they will all look different. Intermediate age: will all look same; homogenizing gene flow. Old age: all look different might have different species that have invaded.