HardyWeinberg

# HardyWeinberg - after one generation of random breeding....

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Hardy Weinberg Principle Population Genetics Modeling Using mathematics to model the behavior of alleles in populations. Hardy-Weinberg Assumption 1. All individuals have equal rates of survival and equal reproductive success. (i.e. no selection.) 2. No new alleles are created or converted from existing alleles by mutation. (i.e. no mutation.) 3. Individuals do not migrate into or out of population (no migration) 4. Population is infinitely large (or large enough that sampling error doesn’t alter allele frequencies from one generation to next)

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Hardy Weinberg Principle • Allele frequencies do not change from generations to generation. • Relationships between allelic and genotypic frequencies can be described by the equation p2 + 2pq + q2 = 1 (Hardy-Weinberg Equation) • If genotypic frequencies are disturbed one generation, they will return to equilibrium
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Unformatted text preview: after one generation of random breeding. • Significance of HW: changes in allele frequency are the genetic basis of evolution. Value of Hardy-Weinberg Principle • Can Evaluate factors that cause populations to evolve Assumption Exception Effect 1. Individuals must randomly mate a. Inbreeding Decrease or /Outbreeding increase in genetic diversity 2. No migration a. Migration Homogenize different Populations 3. No mutation a. Source of all Increase Genetic Variation 4. No selection – all individuals are equally fit and reproductively successful a. Directional Selection Reduce variation b. Disruptive Selection Increase Variation c. Stabilizing Selection Increase Variation 5. Population must be very large a. Genetic Drift Reduce Variation (tend to loose rare alleles)...
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## This note was uploaded on 01/09/2012 for the course BIO 160 taught by Professor Howardhaemmerle during the Winter '12 term at Bellevue College.

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HardyWeinberg - after one generation of random breeding....

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