L09- hardy weinberg-1

L09- hardy weinberg-1 - Georgia Tech School of Biology...

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Biology 1510 Georgia Tech School of Biology Fall 2008 Genetic variation Among individuals - phenotypic difference, molecular differences Discrete and quantitative characters - either-or vs. continuum, single gene with different alleles vs. two or more genes Mutation and sexual reproduction - maintain and introduce genetic variation
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Biology 1510 Georgia Tech School of Biology Fall 2008 Mutation Mutations are changes in the nucleotide sequence of DNA - the majority are deleterious Mutations cause new genes and alleles to arise - mutations in noncoding regions are often harmless Only mutations in cells that produce gametes can be passed to offspring
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Biology 1510 Georgia Tech School of Biology Fall 2008 Mutation
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Biology 1510 Georgia Tech School of Biology Fall 2008 Sexual reproduction - shuffles existing alleles and deals them at random to determine individual genotypes
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Biology 1510 Georgia Tech School of Biology Fall 2008 Natural selection Natural selection increases the frequencies of alleles that enhance survival and reproduction Adaptive evolution occurs as the match between an organism and its environment increases Because the environment can change, adaptive evolution is a continuous process Genetic drift and gene flow do not consistently lead to adaptive evolution as they can increase or decrease the match between an organism and its environment
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Biology 1510 Georgia Tech School of Biology Fall 2008 Natural selection Selection can act only on existing variations Evolution is limited by historical constraints Adaptations are often compromises Chance, natural selection, and the environment interact
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This note was uploaded on 09/04/2009 for the course BIO 1510 taught by Professor Unknown during the Spring '07 term at Georgia Tech.

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L09- hardy weinberg-1 - Georgia Tech School of Biology...

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