311Dchap23b - Genetic variation and natural selection How...

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Genetic variation and Genetic variation and natural selection natural selection How does a population evolve?
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Outline Outline 1. Natural Selection 2. How is genetic variation measured? 3. Directional selection 4. Stabilizing selection 5. Disruptive selection 6. Sexual selection 7. Key terms 8. Conclusions
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Natural selection Natural selection Natural selection is the primary mechanism of adaptive evolution Natural selection Accumulates and maintains favorable genotypes in a population Natural selection increases the frequencies of certain genotypes, fitting organisms to their environment over generations
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How is genetic variation measured? variation measured? Population geneticists measure genetic variation both at the level of whole genes and at the molecular level of DNA. Gene diversity measures the average percent of gene loci that are heterozygous. Humans genetic variation: Gene diversity is about 14% in humans. Nucleotide diversity is only 0.1%.
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311Dchap23b - Genetic variation and natural selection How...

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