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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

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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.

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:

  • 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)


Genetic variation


Factors that influence genetic variability within a population:


1.Genetic drift


2.Gene flow


3.Non-random mating


4.Mutations


5.Natural selection


That list was WHAT?!


Hardy-Weinberg Principle


Five conditions to maintain genetic equilibrium:


Speciation


Types of Population (gene pool) Isolation


Environmental factors


Patterns of Evolution


1. Gradualism


2.Punctuated equilibrium


3. Adaptive radiation/Divergent evolution


4.Convergent evolution


5.Coevolution


6.Extinction


Gradual extinction

  • Western Black Rhino

  • IUCN, 2013 (last seen 2006)


Mass extinction


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