handout 4.7.11 - 4/7/11 1. Heterozygosity ( _ H )...

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Unformatted text preview: 4/7/11 1. Heterozygosity ( _ H ) Proportion of heterozygotes in the gene pool 2. Deterministic Refers to an evolutionary force that changes the allele frequencies of a gene pool in a nonrandom predictable manner.--------------------------------------------------------------------------------------------------------------------------------------------------- LOSS OF HETEROZYGOSITY DUE TO GENETIC DRIFT H t = H {1 [1 / (2 N + 1)]} t H = initial heterozygosity H t = heterozygosity after t generations of genetic drift 2 N = number of alleles for N diploid individuals t generations H t (with N = 20, H = 1) 1 0.98 10 0.78 100 0.08 0.00--------------------------------------------------------------------------------------------------------------------------------------------------- MATING SYSTEMS A. Random mating Mates pair by chance B. Nonrandom mating Mates pair preferentially 1. According to relatedness Inbreeding Related individuals preferentially pair Enforced outbreeding Unrelated individuals preferentially pair 2. According to some trait Positive assortative mating Individuals with same trait/condition preferentially pair Negative assortative mating Individuals with different trait/condition preferentially pair Inbreeding and positive assortative mating promote homozygosity (due to like with like)...
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handout 4.7.11 - 4/7/11 1. Heterozygosity ( _ H )...

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