A)
A
B
C
Directional
Stabilising
Disruptive
B)
Stabilising
Directional
Disruptive
C)
Disruptive
Stabilising
Directional
D)
Directional
Disruptive
Stabilising
Correct Answer: B
Solution :
[b] The graph A, B and C shows stabilising, directional and disruptive traits of natural selection. In stabilizing selection, the median phenotype is selected during natural selection and which does not tilt the bell curve in any way. Instead, it makes the peak of the bell curve even higher than what would be considered normal. Directional selection of natural selection derives its name from the shape of the approximate bell curve that is produced when all individual's traits are plotted. Instead of the bell curve falling directly in the middle of the axes on which they are plotted, it tilts either to the left or the right by varying degrees. Hence, it has moved in one direction or the other. In disruptive selection instead of the bell curve having one peak in the middle, it has two peaks with a valley in the middle of them.
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