ANTH 1001 2-14

ANTH 1001 2-14 - ANTH 1001 2-14 Theories on the mode of...

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ANTH 1001 2-14 Theories on the mode of origin of a species: (A)Gradualism a. Evolution is a continuous process b. Natural selection is the principle force of evolution in speciation (1) Pop. A becomes geographically isolated from pop. B-D. There is no gene flow between (2) Gene pools will diverge from one another, principally by natural selection (3) Pop A becomes so different genetically --reproductively isolated-- from pop B-D and a new species has emerged (4) Graph: wavy, going linearly with branches going off at a deeper slope – Trait (y) vs. Time (x) (B) Punctuated Equilibrium a. Evolution is a discontinuous process. Genetic drift & mutation are the principle forces of evolution in speciation. Evolution involves periods of rapid speciation followed by long periods of evolutionary stasis(that is, there is no meaningful evolutionary change) (1) A small population A becomes geographically isolated from larger populations B-D and Gene flow is blocked.
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ANTH 1001 2-14 - ANTH 1001 2-14 Theories on the mode of...

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