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Directional natural selection and Stabilizing natural selection

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Nestor RutherfordLv2

25 Nov 2018

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When individuals with intermediate values of an inherited phenotypic trait, like head circumference at birth, have an advantage over other individuals in the population, ________ is the apparent pattern of natural selection. a. stabilizing selection b. disruptive selection c. genetic drift d. directional selection

1. the general trend in population density, supported across such diverse groups as mammals, fish, and invertebrates, shows that as organisms size_____ population density ______

2. in arboreal lizards short tails are less useful in balancing while traversing branches, but long tails increase susceptibility to predators. A moderate (average) tail length is therefore preferable. this is an example of: A. disruptive selection B. directional selection C. stabilizing selection D. balanced selection E. natural selection.

describe stabilizing selection, directional selection,and disruptive selection, and identify which ones may beresponsible for the long periods of stasis observed in the fossilrecord