BioLect6 - 1 Natural and Sexual Selection Odds and Ends HW...

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Unformatted text preview: 1 Natural and Sexual Selection Odds and Ends: HW Example 2 Peppered moth genetics continued. After 2 years (multiple generations) the entire population was captured -30 moths 12 of which were white. We genotyped the melanic moths and found that 20 were heterozygous. e. What would you expect the genotype frequencies to be if the population was in HW? f. If you kept these moths in the lab and there was no selection occurring, what would you expect the genotype frequencies to be in the next generation?, The allele frequencies? Peppered moth genetics continued. After 2 years (multiple generations) the entire population was captured =30 moths 3 of which were white. We genotyped the melanic moths and found that 20 were heterozygous. Odds and Ends Wednesday & Friday CH 24 Beak Size in Galápagos 1. Variation 2. Heritable 3. Differential reproduction √ 2 Beak Size in Galápagos 1. Variation 2. Heritable 3. Differential reproduction √ slope = heritability Beak Size in Galápagos 1. Variation 2. Heritable 3. Differential reproduction (survival) √ Beak Size in Galápagos Beak Size in Galápagos Birds with bigger beaks can eat harder seeds target of selection = ? selective agent = ? 3 Evolution Through Natural Selection Natural selection is only evolutionary mechanism that consistently increases match between organism and its environment = adaptive evolution Why doesn't natural selection result in perfect organisms? 1. Selection only acts on existing variation (new mutations don't arise on demand). Why doesn't natural selection result in perfect organisms? 1. Selection only acts on existing variation (new mutations don't arise on demand). 2. Evolution is limited by historical constraints (evolution can only build on what is there-anatomy, physiology, etc). Probably a better way to make these limbs but they had a common ancestor from which they were built: Why doesn't natural selection result in perfect organisms? 1. Selection only acts on existing variation (new mutations don't arise on demand). 2. Evolution is limited by historical constraints (evolution can only build on what is there-anatomy, physiology, etc)....
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BioLect6 - 1 Natural and Sexual Selection Odds and Ends HW...

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