Biology 1001A Lecture Notes - Lecture 13: Assortative Mating, Heterozygote Advantage, Allele Frequency
29 Jan 2019
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Advantage: two or more alleles will "stick around" at a locus- maintains both. Does not matter what allele frequencies you start with, both will move equilibrium. Disadvantage: one allele increases in frequency one decreases. Starting allele frequencies- most important aspect (determines which which disappears) Both require incomplete dominance or codominance doesn"t occur at comple dominant or recessive alleles. Heterozygotes can only have an advantage if they have their own phenotype. Rare alleles are mostly in heterozygotes and common alleles are mostly in ho. Absolute fitness, w, for a genotype is a measurable quantity (avg lifespan, # surviving offspring) The genotype"s w, standardized (divide) by w of the most successful genoty relative fitness, w. Happening any time that the population size is less than infinite. Size of genetic drift is inversely proportional to the size of the population. What if mating is not random with respect of genotype.
