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Lecture22_handout_19Oct11

Lecture22_handout_19Oct11 - BioEE 1780 Evolutionary Biology...

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BioEE 1780 Fall 2011 Evolutionary Biology and Diversity Oct 19 QUANTITATIVE GENETICS TEXT READING for this lecture (Oct 19): Freeman and Herron Chapter 9 sections 9.1 and 9.3, 9.4, 9.5 and 9.6. Particularly emphasize the section 9.1, section 9.3, section 9.4 pages 338-339, section 9.5 page 341, and section 9.6. You may wish to also read section 9.7 for a discussion of some misuses and misinterpretations of the concept of heritability. QUANTITATITE TRAITS A. Most evolutionarily significant traits (phenotypes) are determined by multiple genes in combination with the environment.: 1. Environmental effects on phenotype will result in “continuous” distributions. 2. The combined action of multiple genes to generate phenotype will result in continuous distributions. 3. Traits that are determined by multiple genes and are impacted by the environment will take on a classic “bell-shaped” or “normal” distribution in the population. B. In reality, we never really measure fitness. Instead, we measure phenotypes that we think provide a good estimate of fitness.
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