Lecture 14

Lecture 14 - Lecture 14 DO NOT NEED TO KNOW THE GEOLOGIC...

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Lecture 14 – DO NOT NEED TO KNOW THE GEOLOGIC PERDIODS Conditions for Microevolution o Found effect (not large) o Gene flow (not isolated) o Mutations o Nonrandom mating o Natural selection Balanced polymorphism (more than one form) – balanced selection for or against alleles o Maintains two forms (alleles) because each is favored under different conditions o Sickle Cell Anemia – Malaria and Sickle Cell (ss, tend to die of sickle cell) SS – normal, but tend to die of malaria Ss – okay, better change of surviving malaria and sickle cell Predator avoidance mechanism o Camouflage – may look like background Preying mantis o Mimicry – may look like something distasteful Batesian mimicry – tasteful species looks like a distasteful species Viceroy (tasty) and Monarch (toxic) – the Monarch feeds on Milkweed flowers. Emetic’s, which are found in Milkweeds, make you throw up. The Monarch can concentrate the emetic in its stomach. When the bird eats the butterfly – it gets sick and will not go after other butterflies that resemble it Mullerian mimicry – all distasteful species look alike Bees – wasp, yellowjackets, hornets, honey bee Natural selection as an agent of change – need to explain graph pictured in class o Types of selection – causes the “shift in the range of genetic variation” of
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Lecture 14 - Lecture 14 DO NOT NEED TO KNOW THE GEOLOGIC...

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