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25 Cards in this Set
- Front
- Back
Hybridization |
The crossing of two different species that share common genes
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Directional Selection
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Natural selection that changes the distribution of a trait to favor one extreme phenotype
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Stabilizing Selection
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Intermediate phenotype becomes more common in a population
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Normal Distribution
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A population that is not undergoing natural selection
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Mutation |
A random change in the DNA of a gene which can cause genetic variation
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Founder Effect
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loss of genetic variation that occurs when a new population is established
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Intrasextual Selection
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Competition among the males to mate
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Bottleneck Effect |
Genetic variation is lost - Disaster
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Distributive Selection
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Intermediate phenotypes or selected against both extreme phenotypes
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Genetic Drift
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Changes in allele frequencies within a population
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Allele Frequency |
A measure of how commonly a particular allele occurs in a population
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Speciation
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Is the divergence of two or more species from an existing one
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Behavioral isolation
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A difference of chemical scents between two populations.
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Genetic Mutations |
Are random |
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Enzymes |
Increase the rate of chemical reactions
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Divergent Evolution
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Evolution towards different traits and closely related species
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Mutations and Recombination |
Two main sources of genetic variation
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Coevolution |
Species evolve in response to changes in each other
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Collisions with asteroids in meteorites
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Contributed to the intense heat of the Hadean eon
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Lipid membrane hypothesis / Liposomes |
Act as barriers between organic molecules and the environment
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The discovery that RNA can self-replicate
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Supports the hypothesis THATRNA was the genetic material in the earliest organisms
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Through the process of Endosymbiosis
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Bacteria may have evolved into mitochondria
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The Miller-Urey |
Demonstrated the energy from lightning might have help create earth's first organic molecules
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Cyanobacteria |
Changed the earth by adding oxygen to the atmosphere
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Cell walls
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Found in plant cells, but not in animal cells
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