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Understanding Hardy-Weinberg Equilibrium and Evolution

Fill out the chart to calculate allele and genotype frequencies in a population to determine if evolution is occurring. Learn the significance of deviations from Hardy-Weinberg equilibrium and the impact of various factors on allele frequencies.

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Understanding Hardy-Weinberg Equilibrium and Evolution

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  1. 15.3 PDQ

  2. 1. Fill out the chart

  3. 2. What is the significance of the HW equilibrium? • It allows us to see if evolution is occurring in a population

  4. 3. If all of the above conditions hold, how many generations are required for a population to reach HW equilibrium? • 1

  5. 4. What do deviations from HW equilibrium indicate? • That evolution is occurring!

  6. 5. p. 299 • Calculate the allele and genotype frequencies of Ldh in this newly founded population? Allele frequency of A = 10/20 = 0.5 = p Allele frequency of a = 10/20 = 0.5 = q AA Genotype frequency = 4/10 = 0.4 = P2 Aa Genotype frequency = 2/10 = 0.2 = 2pq aa Genotype frequency = 4/10 = 0.4 = q2

  7. 5. p. 299 #b • No because P2 does not equal 0.4, it equals 0.25. and Q2 does not equal 0.2, it equals 0.25.

  8. 5. #c • Same Allele frequencies: p = 0.5, q = 0.5 (unchanged) Genotype frequencies: Frequency of aa = p2 = 0.25 Frequency of Aa = 2pq = 0.5 Frequency of AA = q2 = 0.25

  9. #5 d • Small population (only 10) • Gene flow could occur (it happened before due to the hurricane!) • Random mating is not possible • Selection for or against a trait could occur

  10. Summarize the effect of the following on allele frequencies

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