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Factors Affecting Genetic Variation-Standard Bio 4.3

Question 2 • Biology_B_IC_Alt

Using the drop-down menus, identify the mode of selection explained below.disruptive selectionstabilizing selectiondirectional selection The finches of the Galapagos Islands changed over time as insects became more plentiful. Finches with smaller and longer beaks were favored.

Answer
A
disruptive selection
B
stabilizing selection
C
directional selection

Explanation

Disruptive selection favors individuals with different extreme traits rather than those near the average. Here, finches with smaller beaks and finches with longer beaks were favored, so the two extremes were selected for. This is disruptive selection, not directional selection, which favors a shift toward just one extreme.

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