Unformatted text preview: vial = population size), then the frequency of the fixed allele would be less close to 50% at the end of the experiment. i) Each vial is like a coin toss – less vials, greater variance in fixing for bw allele or bw75 allele. ii) Genetic drift, not only adaptations, can cause differences among populations. iii) If started with not 50% each – easier to fix for bw75 2) Inbreeding Depression – Mating with relatives, offspring often suffer from reduced fitness. Can also happen if a single fly spawns a colony, t+1 is all inbreeding. i) Assortitive Mating – b) Mutations often cause loss of function (recessive) alleles, ie) deleterious recessives. c) Individuals homozygous for deleterious recessive alleles (because it is a diploid, this can happen) have reduced fitness. One copy of the deleterious “wild-type” recessive most likely won’t cause deleterious effects, but two together will....
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This note was uploaded on 02/09/2012 for the course BIOL 104 taught by Professor Smith during the Spring '09 term at Arkansas State.
- Spring '09