BIO120H1 Lecture Notes - Lecture 7: Genetically Modified Crops, Anemophily, Genetic Drift
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BIO120H1 Full Course Notes
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Bio120: population structure, gene flow, and genetic drift (lecture 7) Wright saw an important role for population structure and genetic drift in evolution. Fisher disagreed and argued that most evolution occurred in large populations by natural selection. Can lead to differentiation even though species are very close geographically. Population: a group of individuals of a single species occupying a given area at the same time. If species are mobile, it is hard to group them. Plants have a dual population system: seeds above ground, seed bank below. Easy to define population, but estimating population size is not easy. Migration: the movement of individuals from one population to another. Gene flow: the movement of genes from one population to another. Migration may be a part of this, but not always. Certain traits under strong selection to diverge while some are under stabilizing selection and haven"t changed at all. Effects of selection, gene flow, and genetic drift on population divergence.
