BIOL 206 Study Guide - Quiz Guide: Ancient Heart, Melanesians, Common Collared Lizard
13 Oct 2016
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Vicariance- physical separation of population by barrier (shrimp) Dispersal- movement across a physical barrier followed by colonization of new land (hawaii drosophila) Individuals meet but something prevents them from interbreeding: different breeding habitats, times, morphology, gametic incompatibility. Individuals meet and reproduce but offspring are not viable: chromosomal differences- varying ploidy numbers (sunflowers, genetic mapping of lentils) Lecture 22- speciation: compare different mechanisms by which populations can diverge. Genetic drift- requires a population bottleneck or founder event. You know its an adaptive trait divergence happens independently in multiple places. Limnetic vs benthic sticklebacks: compare different mechanism by which reproductive isolations can develop. Limnetic vs benthic stickleback- deeper fish are more sensitive to red light. Different habitats can influence traits involved in mate choice diverging mating preferences. Selection against offspring of mixed matings leading to prezygotic isolation. Strong selection occurs to be able tot identify the best individual to mate with.
