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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. - PowerPoint PPT Presentation
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D3: Thursday, 12/19Tahlia 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