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The Hardy-Weinberg Principle

The Hardy-Weinberg Principle. Modern biologists’ definition of “evolution”. = the change in genetic makeup (or gene pool ) of a population over time. What’s a gene pool?. = the frequency of each of the alleles within a population. Hardy & Weinberg (two mathematicians).

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The Hardy-Weinberg Principle

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  1. The Hardy-Weinberg Principle

  2. Modern biologists’ definition of “evolution” = the change in genetic makeup (or gene pool) of a population over time. What’s a gene pool? = the frequency of each of the alleles within a population.

  3. Hardy & Weinberg (two mathematicians) • Developed the Hardy-Weinberg Principle  in large populations in which only random chance is at work, allele frequencies are expected to remain constant from generation to generation. G.H. Hardy Wilhelm Weinberg

  4. What does this mean?

  5. 14 14 10 6 6 10

  6. What causes evolutionary change? Any of the following 5 factors that cause a change in the allele frequencies: 1) Natural selection – favours the passing on of some (advantageous) alleles over others. 2) Small population size – increases likelihood of genetic drift. 3) Mutation – introduces new alleles to a population. 4) Immigration or Emigration – introduces or removes alleles in a population 5) Horizontal gene transfer – the gaining of new alleles from a different species (i.e. Conjugation in bacteria).

  7. The Elephant Problem

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