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D3: Thursday, 12/19. Tahlia collected data for the bluejay population this summer. She calculated the allele frequencies for a certain gene (toe length). Freq A = 0.6, Freq a = 0.4. She plans to sample the population again after three generations.

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D3 thursday 12 19

D3: Thursday, 12/19

Tahlia collected data for the bluejay population this summer. She calculated the allele frequencies for a certain gene (toe length).

Freq A = 0.6, Freq a = 0.4.

She plans to sample the population again after three generations.

If the allele frequencies HAVE NOT CHANGED at that time (0.6, 0.4), is the population evolving for that gene (toe length)?


Key concepts
Key Concepts:

  • Genetic variability: genetic drift, gene flow, non-random mating, mutations, natural selection

  • Genetic equilibrium: Hardy-Weinberg principle

  • Speciation

  • Patterns of evolution: gradualism, punctuated equilibrium, adaptive radiation/divergent evolution,

  • convergent evolution (analogous structures), coevolution, extinction (gradual, mass)



Factors that influence genetic variability within a population
Factors that influence genetic variability within a population:





4 mutations
4.Mutations





Five conditions to maintain genetic equilibrium
Five conditions to maintain genetic equilibrium:












Gradual extinction
Gradual extinction

  • Western Black Rhino

  • IUCN, 2013 (last seen 2006)