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Exam TWO

Exam TWO - Trucemie Down Syndrome Turner Syndrome(just X...

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Forces of Microevolution 2009-02-12 Gene Basic biological unit of heredity Book definition- area in a chromosome pair that determines, wholly or partially, a particular biological trait Allele Different versions of the same gene Book Definition- a biochemical difference involving a particular gene Gene Pool An abstract was to think about the frequency of alleles in a population Microevolution Change in allele frequencies in a population over time Forces of Microevolution Mutation Errors in DNA replication Ultimate source of new variation
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Most people carry at least one lethal mutation usually recessive Example: Sickle Cell Hemoglobin Mutation
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Unformatted text preview: Trucemie- Down Syndrome Turner Syndrome (just X) • Natural Selection ○ Differential fertility or mortality that causes one to be selected for or against, respectively ○ Example: Sickle Cell anemia • Genetic Drift ○ Random Change With respect to alleles Most important in small populations ○ Examples: Partial village destruction by an avalanche Founder Effect • Gene Flow ○ Exchange of genetic material between populations ○ IN human, cultural shapes gene flow ○ Examples: Ireland’s past informs about its current population 2009-02-12 2009-02-12...
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