DnaA then acts at three A-T–rich 13-bp tandem repeats located on the left side of oriC.

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#Id: 9184

#Unit 11. Evolution and Behavior

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#Id: 9185

#Unit 11. Evolution and Behavior

Proportional contribution of genotypes to population

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#Unit 11. Evolution and Behavior

Relative genotypic frequency after selection

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#Unit 11. Evolution and Behavior

Positive Selection: The Spread of Beneficial Mutations

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#Unit 11. Evolution and Behavior

There are three basic modes of selection on a quantitative trait.

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#Unit 11. Evolution and Behavior

Overdominance the heterozygote has higher fitness than the  fitnesses of the two homozygotes

Underdominance, in which the heterozygote has lower fitness than both homozygotes.

Directional selection leads to fixation of the favored allele and elimination of the other allele, as  long as no other evolutionary forces act on the population.