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Byju's Answer
Standard XII
Biology
K-Strategy
The body size...
Question

The body size distribution is depicted in a graph. The effect of stabilizing selection on the distribution can be described by
481252.jpg

A
The mean shifts, and the curve remains the same.
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B
The mean shifts, and the curve becomes narrower.
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C
The mean remains the same, and the curve becomes wider.
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D
The mean remains the same, and the curve becomes narrower.
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E
The mean shifts to both the left and the right, and two new curves form.
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Solution

The correct option is A The mean shifts, and the curve remains the same.
Stabilizing selection is characterized by selection of intermediate phenotype exhibiting maximum fitness and elimination of phenotypic extremes thereby decreasing the genetic diversity. Hence, mean of the graph shift towards the intermediate phenotype through curve remains same. This makes options C and D incorrect and option A correct. Option B is incorrect as curve remains same and option D represents disruptive selection.
Therefore, the correct answer is option A.

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In the graph showing Maxwell, Boltzmann distribution of energy ........ .
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The gas molecules randomly move in all directions and collide with each other and with the wall of the container. It is difficult to determine the speed of an individual molecule but it has become possible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution.
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653966_0e1010dabee9430d8dc0e44affe935bb.png
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