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HARDY-WEINBERG and GENETIC EQUILIBRIUM

Turn in Flipbook! Warm-up 2/19: Make a double bubble comparing and contrasting convergent and divergent evolution. Make sure to include at a minimum:. Homologous Structures Analogous Structures Adaptive radiation Co-evolution Artificial Selection Environment Embryology Biogeography

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HARDY-WEINBERG and GENETIC EQUILIBRIUM

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  1. Turn in Flipbook! Warm-up 2/19: Make a double bubble comparing and contrasting convergent and divergent evolution. Make sure to include at a minimum: Homologous Structures Analogous Structures Adaptive radiation Co-evolution Artificial Selection Environment Embryology Biogeography Vestigial Structures Phenotype Genotype Common Ancestor HARDY-WEINBERG and GENETIC EQUILIBRIUM Ch. 16-1 pp317-320

  2. Variation of Traits in a Population • In a population, organisms tend to show small variations of a trait • Bell Curve – shows that whereas a few fish are very short and a few are very long, most are of average length. • Variations are caused by mutations, genetic recombination, and random-pairing of alleles

  3. The Gene Pool A population is the smallest level evolution can work on, changing the genetic composition of the population over time. GenePool = the total genetic material available in a population Adapting to new selection factors can only use existing genes found in the population AlleleFrequency = the number of a certain allele in the population / the total number of all alleles The phenotype frequencies can change between generations but allele frequencies that create the phenotypes generally do not change very much between generations

  4. The Gene Pool • Gene Pool- genetic variation stored in population • Each allele exists at a certain frequency - gene frequency

  5. Hardy-Weinberg Genetic Equilibrium States that genotypefrequencies remain the same from generation to generation unless acted upon by an outside influence Keep in mind this is theoretical!!! These rules generally allow us to determine the source of a population’s change Makes the following assumptions for a theoretical non-evolving population: 1) No Net Mutations – alleles remain the same 2) Individuals neither enter nor leave the population – no immigration/emigration 3) Large population – ideally infinitely large 4) Random mating 5) Selection does NOT occur – no natural or artificial selection at work

  6. Vocab & HW Read p317-320 Do p320 #1-5 Both Due Wed. • Superposition • Biogeography • Phylogeny/ phylogenic tree • Adaptive Radiation • Allele frequency • Gene pool • Hardy-Weinberg genetic equilibrium

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