ANTH 011 Lecture Notes - Lecture 4: Allele Frequency, Stabilizing Selection, Directional Selection

• School: College of The Sequoias
• Department: Anthropology (ANTH)
• Course: ANTH 011
• Professor: ashford

Document Summary

A change in allele frequency over time. Mutations create variations within the gene pool. Populations become better adapted to their environment based on fitness. Selection at one end of the range of phenotypes. Selection arising as a result of preference by one sex for certain characteristics of the other sex. The introduction of alleles from one population into another due to migration and mating. Chance changes in allele frequency from one generation to the next. High populations due to small size of gene pool. Reduction in genetic diversity due to dramatic temporary decrease in population size. Loss of genetic variation when a new colony is established. To be in equilibrium none of the evolutionary mechanisms are operating; otherwise, the allele frequencies would be changing. Populations in equilibrium have special mathematical properties. The same frequencies show up in every generation. No mutation, gene flow, natural selection, or random mating.