Week 6 notes
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This 1 page Class Notes was uploaded by Courtney Parks on Monday February 29, 2016. The Class Notes belongs to BZ 220 at Colorado State University taught by Angeloni, Lisa Maria in Fall 2016. Since its upload, it has received 45 views. For similar materials see Introduction to Evolution in Biology at Colorado State University.
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Date Created: 02/29/16
Heterozygote superiority- overdominance o Stable equilibrium frequency, with both alleles maintained over time Heterozygote inferiority- underdominance o Unstable equilibrium, with fixation of either allele depending on starting frequency Frequency-dependent selection o Rare phenotype has greater fitness Selection conclusions o Selection can change allele and genotype frequencies Rate of change is predictable based on: 1. Fitness of each genotype 2. Starting allele frequencies Starting selection causes faster change o A favored dominant allele increases quickly when rare, but slows down as it becomes common o A favored recessive allele increases slowly when rare, but speeds up as it becomes common o Some forms of selection decrease allelic diversity If one allele favored Heterozygote inferiority o Some forms of selection maintain allelic diversity Heterozygote superiority Frequency dependent selection