BIOA01H3 Lecture Notes - Lecture 8: Silent Mutation, Genetic Drift, Hypopigmentation

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19 Apr 2016
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BIOA01H3 Full Course Notes
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Definition: any process that results in changes in the frequency of alleles present in populations: mutation: any heritable change in dna. Introduces new genetic variation into population: migration (gene flow): changes in allele frequency as individuals join a population and reproduce. May introduce genetic variation from another population: genetic drift: random changes in allele frequency by chance events. Reduces genetic variation, especially in small populations; can eliminate alleles: natural selection: differential survivorship or reproduction of individual with different phenotypes. One allele can replace another or allelic variation can be preserved if phenotypes are inherited. Adaptations: traits that increase the fitness of organisms relative to others without the trait. Wild type: the most common form of a gene in nature. Fixation: process by which an allele increases in frequency until it is present at 100% in a population. Ultimate source of all heritable change in dna.

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