BIO120H1 Lecture Notes - Lecture 7: Genetically Modified Organism Containment And Escape, Monomorphism, Assortative Mating

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19 Apr 2016
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BIO120H1 Full Course Notes
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BIO120H1 Full Course Notes
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Lecture 7: populations structure, gene flow, and genetic. Flightlessness increases in frequency on oceanic islands, largely because there are no predators there. Flight is usually there to help birds to escape predation. Flight is a mutual trait, but can be maladaptive (e. g. on oceanic islands, where they may fly away and never come back). Populations on oceanic islands is due to accidents, where birds may fly to the island by mistake. There"s no selection pressure to maintain wings as an antipredator mechanism. Populations are differentiated from one another within the landscape (population structure); genetic drif can play an important role in this process. Wright saw an important role for population structure and genetic drif in evolution. Fisher disagreed and argued that most evolution occurred in large populations by natural selection. Most progressive evolutionary change giving us adaptation and species was occurring in large populations with plenty of genetic variability. In the spring, there"s a big difference on the slopes.

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