Types of Natural Selection

Question 1

3 types of natural selection

Answer 1

directional, stabilizing, and disruptive

Question 2

Directional Selection

Answer 2

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

Question 3

Stabilizing Selection

Answer 3

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

Question 4

Disruptive Selection

Answer 4

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

Question 5

Why does the curve of a directional selection shift?

Answer 5

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

Question 6

What does the graph of a stabilizing population look like?

Answer 6

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

Question 7

What must happen for disruptive selection to occur?

Answer 7

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)