BILD 3 Lecture Notes - Lecture 5: Fisherian Runaway, Bild, Disruptive Selection
12 Oct 2016
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Document Summary
Only acts on variation available in a population natural selection is not. Acts on individuals but consequences measured in populations. Acts on phenotypes, but only the genotype is heritable. Disruptive selection: sex that invests more energy should be choosier, since it is limited in mate number, typically females adopt a mate quality strategy and males adopt a mate quantity strategy. The (cid:498)good genes(cid:499) hypothesis suggests that if a trait is related to male genetic. This could cause runaway evolution as the trait and preference become correlated genetically in a positive feedback loop. Change in the genetic composition of a population caused by chance events/sampling error. Can cause allele frequencies to change at random. Can lead to a loss of genetic variation within populations. Can cause harmful alleles to become fixed. Sampling error: chance differences between a sample and the entire population, smaller samples more sampling error, independent assortment of chromosomes in meiosis.
