Download 16.1 Genes and Variation Genetic Variation Evolution is studied in

16.1 Genes and Variation
Genetic Variation
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Evolution is studied in _____________, not ______________
A population is a
Each gene has ______ versions, which may or may not be identical
Gene Pool
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Gene Pool:
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Relative frequencies:
There are 25 individuals in the population, make a total of ______ alleles
If there are 20 black alleles what is the frequency? ______
Sources of Variation
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Gene shuffling:
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This is the __________ source of variation
What type of variation rarely occurs?
Possible Genotype
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Single-gene trait:
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o Provide an example
Polygenic trait:
o
Provide an example
16.2 Evolution as Genetic Change
Natural Selection and Genes
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When does evolution occur?
Explain why does this occur?
Single-Gene Traits
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Over time what occurs to a phenotype of a single-gene trait?
Polygenic Traits
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Directional Selection:
o
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Stabilizing Selection
o
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Draw an example
Draw an example
Disruptive Selection
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Draw an example
Small Populations
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Genetic drift:
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Founder effect:
Hardy-Weinberg Principle
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Explain what Hardy-Weinberg Principle is
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Genetic equilibrium:
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What 5 things must occur for genetic equilibrium?
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16.3 The Process of Speciation
Speciation:
Species:
Isolation Mechanisms
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Reproductive isolation:
o
Behavioral Isolation:
o
Geographic isolation:
o
Temporal Isolation:
Speciation in Darwin’s Finches
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In what was did speciation in the Galapagos finches occur? Explain each one