Types of Natural Selection Flashcards

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1
Q

3 types of natural selection

A

directional, stabilizing, and disruptive

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2
Q

Directional Selection

A

When individuals at one end of the curve have higher fitness than individuals in the middle or at the other end

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3
Q

Stabilizing Selection

A

individuals near the center of the curve have higher fitness than individuals at either end of the curve

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4
Q

Disruptive Selection

A

individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle

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5
Q

Why does the curve of a directional selection shift?

A

The range of phenotypes shifts as some individuals fail to survive and reproduce while others succeed.

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6
Q

What does the graph of a stabilizing population look like?

A

keeps the center of the curve at its current position, but it narrows the overall graph

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7
Q

What must happen for disruptive selection to occur?

A

a pressure that is strong enough and lasts long enough

(makes it possible to split the single curve into 2 and result in 2 distinct phenotypes)

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