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Unformatted text preview: Dr. Susan Foster BIOL 105 Evolution 9.24.07 Evolution- Change in gene frequency between generations in a population I) Requirements for Evolution 1) Variation a Key mutations that lead to traits for natural selection to act upon Examples: Liguus fisciatus Black-bellied seed cracker 2) Variation Heritable a Change in frequency can be transferred between generations You are what you eat: Tonicella (chiton): Takes on the color of the algae it eats Not genetic environmental 3) Some variants reproduce more successfully than others a Differential reproductive success (i) One phenotype has higher mean reproductive success than the other This trait will be carried on only if the trait is heritable (ii) Note: not all individuals of one phenotype have higher reproductive success than another (iii) No difference in mean reproductive success (No differential reproductive success) b Differential reproductive success II) Allelic Evolution 1) Change in allele frequencies within a population between generations- Phenotype depends on nature of interaction between alleles (change in allele frequencies between generations...
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