Population Genetics and Natural Selection
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Created by:
billgoll on March 27, 2012
Subjects:
Classes:
DRHS honors biology 2012, bsxl store room
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16 terms
Terms | Definitions |
|---|---|
 Natural Selection | Different success in reproduction caused by inheritable differences being favored or disfavored by the environment. |
| Natural Selection | Process by which nature provides the variations and nature selects the alleles that are most fit. |
| Artificial Selection | Process by which nature provides the variations and humans select the alleles that they want. |
| Population | Members of one species living, competing, and interbreeding together. |
| Genetic Variation | Difference (variety) in alleles caused by mutation or sexual reproduction. |
| Fitness | How well an organism can survive and reproduce in its environment. |
| Genetic Drift | Random change in the frequency of alleles caused by chance occurrences. |
| Directional Selection | Natural selection type where individuals at one end of a distribution curve have a higher fitness than those at the other end. |
| Stabilizing Selection | Natural selection type where individuals in the middle of a distribution curve have a higher fitness than those at the ends. |
| Disruptive Selection | Natural selection type where individuals at both ends of a distribution curve have a higher fitness than those in the middle. |
| Natural Selection Requirements | Genetic Variation & Differential Reproductive Success |
| Relative Frequency | How many of one type of allele is present in a gene pool compared to other alleles. |
| selected for | A trait or gene variant that tends to help individuals leave more offspring |
| selected against | A trait or gene variant that tends to interfere with individuals leaving more offspring |
| Polygenic trait | an inheritable trait that has a bell shaped distribution curve for a population |
| Polygenic trait | an inheritable trait that is controled by two or more genes |
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