BISC 102 Lecture Notes - Lecture 8: Phenotypic Trait, Selective Breeding, Stabilizing Selection
19 Oct 2015
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Document Summary
Changes of a genetic makeup of a population of organisms by selecting individuals. Artificial selection: ex: different breeds of dogs. is a deliberate selection of certain individuals to produce certain characteristics. happens in plants. Natural selection: natural process. favours certain genotypes over others. acts on individuals but changes the population, not the individual. Sexual selection: compromise between the survival trait and breeding success. Picture 1: beetle population with varied inherited traits (light color and dark color) Picture 2: predator comes by and goes for light-coloured beetles. Picture 3: reproduction of survivors, all darker color. All this depends on environmental pressures. selection will favour the certain heritable traits that will be used through the differential reproductive success. Refers to 2 different morphs of the same species. Human females: tiny, not too big, tall or heavy. gentle, soft, emotional Human males: tall, strong, heavy, aggressive, tough Birds have very different morphs. hard to tell if its a male or female.
