Chapter 23

Chapter 23 - BIO 152 Notes Chapter 23: Evolution of...

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BIO 152 Notes Chapter 23: Evolution of Populations Concept 23.1 microevolution – change in the genetic makeup of a population from generation to generation R.A. Fisher – showed the rules by which Medelian characters were inherited J.B.S. Haldane – studied rules of natural selection **Conditions for Hardy-Weinberg Eq.** 1. extremely large population size 2. no gene flow (closed population) 3. no mutations 4. random mating 5. no natural selection Concept 23.2 variation – two processes, mutation and sexual recombination, produce the variation in gene pools that makes natural selection possible mutation – new genes and new alleles originate only by this means, most occur in somatic cells *point mutations – a change of one base in a gene, can be significant (sickle-cell), but most are harmless *duplication – almost always harmful, can be beneficial if the duplication survives over generations *mutation rates – eukaryotes (1 in 100,000 genes per generation), HIV has a generation span of about two days
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This note was uploaded on 04/11/2008 for the course BIO 152 taught by Professor Mort during the Spring '08 term at Kansas.

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Chapter 23 - BIO 152 Notes Chapter 23: Evolution of...

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