BLG 144 Lecture Notes - Lecture 2: Assortative Mating, Allele Frequency, Genotype Frequency

• School: Ryerson University
• Department: Biology
• Course: BLG 144
• Professor: Andrew Laursen

Document Summary

Mechanisms exam: natural selection and sexual selection, genetic drift, gene flow within population, mutation, gene flow between populations, immigration. Non-random mating: mating may not be random in nature with respect to any particular gene in question, 3 mechanisms that violate h-w assumption of random mating. Increases the frequency of homozygotes and reduces the frequency of heterozygotes in each generation: does not cause evolution allele frequencies do not change in the population as a whole. Inbreeding and other forms of non-random mating change genotype frequencies not allele frequencies. Inbreeding does not change the allele frequencies only genotypic frequencies: alleles are still there the genotypes have resorted, speed up the evolutionary change, cause elimination to recessive genes, purifying selection can occur. Tail feathers in peacock males have more elaborated tails pressured through sexual selection: males tend to have more traits that function only in courtship and male-male competition, male-male competition, ex.