Biology
Grade-9
Easy
Question
When the changing environment favors one extreme phenotype it is called:
- Stabilizing selection
- Disruptive selection
- Directional selection
- Genetic drift
Hint:
In an ecosystem where giraffes with the longest necks are able to reach more leaves, selective pressures will work in the advantage of the longer neck giraffes.
The correct answer is: Directional selection
Directional selection occurs when selective pressures are working in favour of one extreme of a trait.
Consider the example where
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