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Consider The Data On Cliff Swallow Mortality. Why Is This An Example Of Directional Selection?

1.) The average trait value changed in one direction (in this case, larger size). 2.)Overall genetic variation decreased. 3.)Individuals with intermediate phenotypes survived best. 4.)Selection did not occur, because no reproduction occurred just survival.
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1.) The average trait value changed in one direction (in this case, larger size).

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