Variations in Populations

AP Biology· difficulty 2/5

Survival rates of newborn babies plotted against birth weight (Karn & Penrose study).

The peak survival at intermediate birth weight illustrates which selection mode?

A
$Stabilizing selection$
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B
$Disruptive selection$
C
$Sexual selection$
D
$Directional selection$

Explanation

Stabilizing selection favors intermediate phenotypes (here, average birth weight) and selects against both extremes, narrowing variation around the optimum.

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