BIOL 2400 Lecture Notes - Lecture 10: Population Bottleneck, Mtdna Control Region, Prentice Hall
25 Dec 2014
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2 alleles in population: a1, a2: 3 genotypes: a1a1, a1a2, a2a2. 3 alleles in population: a1, a2 ,a3: 6 genotypes: a1a1, a1a2, a1a3, a2a2, a2a3, a3a3. The effect of genetic drift is inversely related to population. Small populations = large effects. (10% to 9%) (10% to 0%! loss in variation) Genetic drift for eye colour in 107 populations of 16 drosophila: no dominance (2 copies = red eyes, 0 copies = yellow/white eyes . Genetic drift causes evolution in finite populations (same thing as above, from textbook) Estimating the effective population size, decline in heterozygosity for eye colour over 20 generations declined must faster than expected/theorized: was a mystery , effective population number of 9 worked well! Estimating the effective population size, ne, from nc, the census population size. Example 2: male to male competition leads to extreme variance in reproductive success.
