Lecture 019 - Upsetting The Equilibrium

Lecture 019 - Upsetting The Equilibrium - Outline:...

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1 Bio1222 Outline: Upsetting the Equilibrium Outline: Upsetting the Equilibrium • Absolute vs relative fitness • How can we tell if a trait is evolving? • Selection as an agent of evolution – Modes of selection Bio1222 Population genetic terminology Population genetic terminology •Locus • Allele • Allele frequency •Genotype • Genotype frequency
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2 Bio1222 How can we tell if a trait is evolving? How can we tell if a trait is evolving? • Need a point of reference • Describe a population at equilibrium, not evolving – No selection – No mutation – No gene flow (immigration/emigration) – No genetic drift – No nonrandom mating C R C W C W C W C R C R Bio1222 Calculate starting allele frequencies Calculate starting allele frequencies • Simplest case: 2 alleles (p+q=1)
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Bio1222 Recall Recall Punnet Punnet square method and product rule square method and product rule • Calculates expected genotype and phenotype frequencies for a family Bio1222 Without nonrandom mating Without nonrandom mating • Can predict offspring genotype frequencies from starting allele
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Lecture 019 - Upsetting The Equilibrium - Outline:...

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