BIOLOGY 171 Lecture Notes - Lecture 9: Allele Frequency, Genetic Drift, Genotype Frequency
23 Oct 2016
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Document Summary
Sexual selection increases an individual"s reproduction success (437-438) Sexual selection promotes traits that increase an individual"s access to reproductive opportunities. 2 ways: intrasexual selection: members of one sex (usually male) compete with one another for access to the other sex (usually female) Focuses on interaction between individuals of one sex: intersexual selection: males (usually) complete for attention of females with bright colors and other displays and the females (usually) choose a mate. Focuses on interaction between individuals of both sexes. Migration, mutation, genetic drift and non-random mating (438-440) Migration, mutation, genetic drift, and non-random mating can also change allele and genotype frequencies, but unlike natural selection, they do not lead to adaptations. Migration: the movement of individuals from one population to another, resulting in gene flow, which is the movement of alleles from one population to another: consequence: homogenizing of populations and reduction of genetic differences between populations. Mutations: a rare event, source of new alleles.
