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HARDY-WEINBERG and GENETIC EQUILIBRIUM

HARDY-WEINBERG and GENETIC EQUILIBRIUM. CH. 16-1 PP 317-320. The Gene Pool. Population – group of the same species living in the same area. The Gene Pool. In a population, organisms tend to show small variations of a trait EX: __________________. The Gene Pool.

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HARDY-WEINBERG and GENETIC EQUILIBRIUM

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  1. HARDY-WEINBERG and GENETIC EQUILIBRIUM CH. 16-1 PP 317-320

  2. The Gene Pool • Population – group of the same species living in the same area.

  3. The Gene Pool • In a population, organisms tend to show small variations of a trait • EX: __________________

  4. The Gene Pool • In a population, organisms tend to show small variations of a trait • EX: __________________ • Gene Pool- total genetic information stored in a population • EX: __________________

  5. The Gene Pool • In a population, organisms tend to show small variations of a trait • EX: __________________ • Gene Pool- total genetic information stored in a population • EX: __________________ • Allele frequency- Each allele exists at a certain frequency • EX: __________________

  6. Variation of Traits in a Population • Histogram- graph showing frequencies of each trait. Usually displays a bell curve.

  7. Variation of Traits in a Population • Histogram- graph showing frequencies of each trait. Usually displays a bell curve. • Bell Curve – shows that most members of a population have a similar variation of a trait. Only a few individuals display extreme variations of the trait. EX: A few fish are very short and a few are very long, most are of average length

  8. WHAT CAUSES THESE VARIATIONS? • Mutations- Random change in DNA passed to offspring

  9. WHAT CAUSES THESE VARIATIONS? • Mutations- Random change in DNA passed to offspring • Recombination- reshuffling of genes during Meiosis • Independent assortment • crossing over

  10. VARIATION OF TRAITS IN A POPULATION • Mutations- Random change in DNA passed to offspring • Recombination- reshuffling of genes during Meiosis • Independent assortment • crossing over • Random pairing of gametes

  11. Hardy-Weinberg Genetic Equilibrium • Hardy-Weinberg equilibrium describes populations that are not evolving • Genotype frequencies stay the same over time as long as certain conditions are met: • Very large populations • No emigration or immigration • No mutations • Random mating • No natural selection

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