The rate of sedimentation is dependent upon the applied centrifugal field (cm s-2), G,

that is determined by the radial distance, r, of the particle from the axis of rotation (in cm)

and the square of the angular velocity ω, of the rotor (in radians per second):

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#Id: 2254

#Unit 11. Evolution and Behavior

Frequency-dependent selection,

1.    Positive frequency

2.    Negative frequency

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#Id: 2255

#Unit 11. Evolution and Behavior

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

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#Id: 2256

#Unit 11. Evolution and Behavior

Overdominance, the heterozygote has higher fitness than the  fitness of the two homozygotes.

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#Id: 2257

#Unit 11. Evolution and Behavior

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

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#Id: 2258

#Unit 11. Evolution and Behavior

Directional selection leads to fixation of the favored allele and elimination of the other allele.

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#Id: 2259

#Unit 11. Evolution and Behavior

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.