BISC208 Lecture Notes - Lecture 2: Allele Frequency, Genotype Frequency, Genetic Drift

• School: University of Delaware
• Department: Biological Sciences
• Course: BISC208
• Professor: Rohe Benjamin

Document Summary

Change in allele frequencies driven by four processes. Natural selection increases the frequency of alleles that contribute to reproductive success in a particular environment. Genetic drift causes allele frequencies to change randomly. Gene flow occurs when individuals leave one population, join another and breed. Mutation modifies allele frequencies by continually introducing new alleles. Natural selection is not the only process responsible for evolution. Each of the four evolutionary processes has different consequences for genetic variation and fitness. Mathematical null hypothesis of study of evolutionary processes. A1 and a2 = p and q. Predicts the genotype frequencies and allele frequencies in the nest generation. If frequencies conform to the predictions, then frequencies are in hardy- weinberg equilibrium. Based on 5 assumptions about the behaviors of populations and alleles. All individuals contribute equally to gene pool. No genetic drift (random allele frequency changes) Alleles not picked by chance because assamese population in large. No new alleles added or lost from gene pool.