Phys A L5

Phys A L5 - 10/17/2007 Physical Anthropology: Lecture 5...

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10/17/2007 Physical Anthropology: Lecture 5 (Chapter 3) I. How Does Natural Selection Change Gene Frequency A. If different genotypes are associated with different phenotypes and those different phenotypes differ in ability to reproduce, then the alleles that lead to development of favored phenotypes with increase in frequency B. q’= [(# of gametes per aa parent after selection)(# of aa parents after selection) + (# of a gametes per Aa parent after selection)(# of Aa parents after selection)] / [(# gametes per parent)(Total # parents after selection)] C. When “q” goes to “q’” the frequency decreases 1. Selection can’t produce change unless there is variation in population 2. Selection doesn’t operate directly on genes 3. Strength and direction of selection depends on environment (ie: medical care) II. Modern Synthesis A. Initially through Mendelian Genetics was incompatible with Darwin’s theory of evolution by natural selection B. Eventually reconciled in a body of theory that solved the problem of explaining
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This note was uploaded on 04/08/2008 for the course ANTH 5 taught by Professor Gaulin during the Fall '07 term at UCSB.

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Phys A L5 - 10/17/2007 Physical Anthropology: Lecture 5...

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