11_Genetic_Variation

11_Genetic_Variation - Genetic Geneticvariation Today

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enetic ariation Genetic variation d ’ ti Wh tit ti ti t Today’s questions: Why are many quantitative traits normally distributed? Where does genetic riation come from? And why did sex evolve? variation come from? And why did sex evolve? olygenic inheritance (review) I. Polygenic inheritance (review) II. Four sources of genetic variation I he evolution of sex III. The evolution of sex
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I. Polygenic inheritance Basic assumptions of the model: 1. Many genes are involved in 3. In a population, there are many alleles 2. The genes assort 4. The effects of each allele
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M. lewisii M. cardinalis
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. wisii . rdinalis X M. lewisii M. cardinalis F 1 s F 2 s
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Dr. Bradshaw’s group planted F 2 s at random locations in tl hb i tt i th Si Nd ti th natural habitat in the Sierra Nevada mountains, then recorded which pollinators visited which flowers. 1. Circle the individuals that had the most visits from bumblebees. 2. Put a star next to individuals that had the most visits from hummingbirds.
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Where does all this variation come from?
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This note was uploaded on 05/25/2010 for the course BIO 180 taught by Professor Bradshaw during the Spring '09 term at University of Washington.

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11_Genetic_Variation - Genetic Geneticvariation Today

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