BIO120H1 Lecture Notes - Lecture 7: Genetic Drift, Neutral Theory Of Molecular Evolution, Gene Flow
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BIO120H1 Full Course Notes
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Lecture 7: geographic variation (pop structure, gene flow, genetic drift) 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. Group of individuals of a single species occupying a given area at the same time. Migration-movement of individuals from one population to another. Gene flow- movement of genes from one population to another. What proportion of all genetic variation in species is due to fitness between populations: how is diversity distributed within vs between populations. Genetic markers: polymorphic neutral variation used to study pop processes. Some weeds are relatives of crops, inter-fertile: transgenes (gene transfer by recombinant dna technology) Sunflower crops: most gene flow occurs over a short distance, small amount as far as 1km. Risk assesment: proximity of wild relatives (interfertile, pollination system animal v wind, mating system- selfer v outcrosser. Stochastic (unpredictable: mutation, recombination, gene flow (not fully, genetic drift.
