Biology
Grade-9
Easy
Question
The following graph shows which type of natural selection?
- Stabilizing selection
- Disruptive selection
- Directional selection
- Genetic drift
Hint:
the graph is showing a directional selection
The correct answer is: Directional selection
- In directional selection, the selection is made against one extreme of the trait distribution.
- The distribution of traits in the population swings to the other extreme.
- The population graph's mean shifts in the case of such selection.
- Using the well-known example of giraffe necks, there was selection pressure against short necks since these individuals could not reach as many leaves for grazing.
- The distribution of neck length changed, as a result, favoring people with long necks.
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