Test 1 Notes - Evolution of Populations

Test 1 Notes - Evolution of Populations - Principles of...

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Principles of Biology II - Leege Georgia Southern University Evolution of Populations I. What is Evolution? Change in genetic composition of a population over time The Modern Synthesis à Population genetics is the study of how populations change genetically over time à Population genetics integrates Mendelian genetics with the Darwinian theory of evolution by natural selection à This modern synthesis focuses on populations as units of evolution What is evolution in Genetic terms? à Changes in proportions of alleles present in a population for a particular trait across generations Gene Pools and Allele Frequencies à Population: localized group of individuals capable of interbreeding and producing fertile offspring à Gene pool: all genes in a population at any one time à Gene pool consists of all gene loci in all individuals of the population II. How do we measure evolution? Population Genetics Hardy Weinberg Theorem Hardy Weinberg Theorem à Describes a population that is not evolving à Frequencies of alleles and genotypes in a population's gene pool remain constant from generation to generation, provided that only Mendelian segregation and recombination of alleles are at work à Mendelian inheritance preserves genetic variation in a population Figure 23-4 Preservation of Allele Frequencies In a given population where gametes contribute to the next generation randomly, allele
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Test 1 Notes - Evolution of Populations - Principles of...

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