NATS 1940 Lecture Notes - Lecture 12: Electron Shell, Assortative Mating, Genotype Frequency
19 Oct 2017
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Hw assumes all individuals mate at random. E. g, more likely to mate with close neighbours. Increases frequencies of homozygotes; reduces frequency of heterozygotes. Assortative mating = when individuals select partners similar to themselves. Also increases frequencies of homozygotes, decreases frequencies of heterozygotes. Sexual selection is not a type of non-random mating. Some genotypes have a reproductive advantage over others. In non-random mating, no genotype has a reproductive advantage. Random changes in the dna of an organism. Can change an allele into a different (sometimes new) allele. In gametes, can affect p & q of next generation. Have little effect by themselves on p & q. Could have big effect in combination with natural selection. In organisms with short generation spans (e. g. bacteria & viruses) there are more opportunities for mutations to occur. Mutations are the main source of new alleles. From mendel and darwin: we know how alleles behave under natural selection, and how they are passed on via egg/sperm.
