Ch 23 - The Evolution of Populations (1 slide per page)-1

32 160 w 160 w 08 w 200 1000 20 500 004 40 w

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Unformatted text preview: 500 = 0.64 Number of alleles in gene pool (total = 1,000) 640 W Allele frequencies 800 1,000 = 0.32 160 W + 160 w = 0.8 W 200 1,000 20 ––– 500 = 0.04 40 w = 0.2 w 17 17 Alleles are present in all of the gametes in a population at the same proportion as in the parental gene pool Sperm W sperm w sperm 0.8 0.2 W egg 0.8 Eggs w egg 0.2 18 18 If random mating occurs, the expected genotype frequencies in the next generation are: W egg 0.8 Sperm W sperm w sperm 0.8 0.2 WW Ww 0.64 0.16 Eggs w egg 0.2 wW 0.16 ww 0.04 19 19 Genotype & allele frequencies in the next generation are the same as they were in the parental generation W egg 0.8 Sperm W sperm w sperm 0.8 0.2 WW Ww 0.64 0.16 Eggs w egg 0.2 ww 0.04 wW 0.16 Next generation: Genotype frequencies Allele frequencies 0.64 WW 0.32 Ww 0.8 W 0.04 ww 0.2 w 20 20 Hardy Weinberg Equilibrium Allele and genotype frequencies will stay the same in a population btwn generations unless outside forces act to change those frequencies. What “outside forces” cause allele frequencies to change? • Natural selection • Genetic drift • Gene flow • Mutation Mechanisms of evolution How Does Natural Selection Cause Allele Frequencies to Change? 21 21 • Individuals compete for scar...
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This note was uploaded on 02/12/2014 for the course BIOLOGY 2011 taught by Professor Woo during the Fall '10 term at University of Central Florida.

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