Lecture20_handout_14Oct11 - BioEE 1780 Evolutionary Biology...

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BioEE 1780 Fall 2011 Evolutionary Biology and Diversity Oct 14 GENETIC DRIFT TEXT READING for this lectures (Oct 14): Freeman and Herron Chapter 7 section 7.2. Specifically emphasize pages 232-240, 242-245. Pages 249-251 may appeal to those of you with advanced interests in the subject, but will not be formally covered as part of this course. Rates of molecular evolution are covered in some detail in more advanced Cornell courses such as Molecular Evolution (BioMG 4840), Population Genetics (BioMG 4810), and Ecological Genetics (BioEE 4800). GENETIC DRIFT A. Genetic drift and chance events in evolution of populations 1. Genetic Drift occurs because of random events affecting transmission of alleles from one generation to the next. a. Real populations aren’t infinite in size, and random death of adults can change allele frequencies in populations. b. Because real populations are finite in size, random success of gametes in forming embryos can cause allele frequencies to change from one generation to the next.
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Lecture20_handout_14Oct11 - BioEE 1780 Evolutionary Biology...

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