BIO120H1 Lecture Notes - Lecture 7: Heterostyly, Mating System, Allele Frequency
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BIO120H1 Full Course Notes
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Wright saw an important role for population structure and genetic drift in evolution. Fisher disagreed, argued evolution occurred in large populations by natural selection. Population- group of individuals of a single species occupying a given area at the same time. Migration- movement of individuals from 1 population to another. Gene flow- movement of genes from 1 population to another. It is difficult to observe and measure. Distinguish potential vs. actual (has new genes mated or was the gene spread?) Distinguish gamete vs. individual (travel in group?) Use neutral genetic markers* (polymorphic neutral genetic variation used to study processes affecting genetic diversity. Effects of selection, gene flow and genetic drift of population divergence: Risk assessment of crop transgenes into wild relatives: High risk= wind pollinated outcrosser with relatives nearby. Stochastic (unpredictable) forces: mutation, recombination, gene flow, genetic drift. Deterministic (predictable) forces: natural selection (how it will affect a trait, strength or selection and number to determine changes)
