09_pop.genetics - The Modern Synthesis: Re-statement of...

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The Modern Synthesis: Re-statement of Darwin’s Postulates As a result of mutation creating new alleles, and segregation , independent assortment and crossing over shuffling alleles into new combinations, individuals within populations are variable for many traits. Individuals pass their alleles on to their offspring intact. In every generation, some individuals are more successful at surviving and reproducing than others. The individuals that survive and reproduce, or who reproduce the most, are those with the alleles or allelic combinations that best adapt them to their environment. The outcome is that alleles associated with higher fitness increase in frequency from one generation to the next.
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Mendelian Genetics in Populations • Evolution is defined as a change in allele frequencies over time. • Natural selection acts on phenotypes in individuals , but evolutionary change occurs in populations . • The genetics of evolutionary change is population genetics.
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Why is genetic diversity important?
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main but not exclusive means of modification”. C. Darwin, 1859.
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This note was uploaded on 05/18/2008 for the course CSE 142 taught by Professor Martystepp during the Spring '07 term at University of Washington.

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09_pop.genetics - The Modern Synthesis: Re-statement of...

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