BIOL 110 Lecture Notes - Population Bottleneck, Zygosity, Genotype Frequency

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19 Jan 2013
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If there is only one allele at a locus, its frequency = 1. The population is monomorphic at that locus; the allele is said to be fixed. The population is said to be polymorphic at a locus, if there are more than one allele at that locus. The genetic structure of a population does not change over time if certain conditions exist. If an allele is not advantageous, its frequency remains constant from generation to generation, its frequency will not increase even if the allele is dominant. A population of sexually reproducing organisms in which allele and genotype frequencies do not change from generation to generation is said to be at hardy weinberg equilibrium. Genotype frequencies can be predicted from allele frequencies. No change to alleles a and a, and no new alleles are added to change the gene pool: natural selection does not affect the survival of particular genotypes. There is no differential survival of individuals with different genotypes.

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