Lecture 7 - 1 Lecture 7 Non-Random Mating Monday Jan.20th...

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Lecture 7: Non-Random Mating Monday, Jan.20 th Reading: Chapter 7.1 1
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Learning Objectives 1.Define Assortative and Disassortative mating 2.Explain why nonrandom mating is not considered a direct mechanism of evolution 3.Identify and explain the effect of nonrandom mating on the genetic diversity of a population 4.Define inbreeding depression 5.Explain why inbreeding could lead to the purging of deleterious recessive alleles from the population 6.Define heterostyly and explain how it promotes disassortitive mating 7.Describe a scenario under which assortative mating could be beneficial, despite the risks of increased rates of inbreeding 2
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Non-random mating What Don’t we mean? If one particular phenotype is less successful at acquiring mates, that would be selection and that is NOT what we are talking about here. 3
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Non-random mating What Do we mean? Everyone mates , but WHO they mate with is NOT determined randomly Non-random mating is not a mechanism that directly drives evolution, but it can create conditions upon which selection can act… 4
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Nonrandom mating Disassortative mating: individuals choose mates phenotypically less similar to themselves than expected by chance Promotes outbreeding – mating between unrelated individuals Rare in mammals 5
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Nonrandom Mating
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  • Spring '11
  • DAVIDSON
  • Genetics, Evolution, Mating system, Inbreeding, outcrossing, Disassortative mating

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