Question

In disruptive selection, organisms represented by which part of the curve have the lowest fitness? Circle the correct answer.
A. middle of the curve
B. ends of the curve

Answer 1

Answer:

Graph 1 shows directional selection, in which a single extreme phenotype is favored. Graph 2 depicts stabilizing selection, where the intermediate phenotype is favored over the extreme traits. Graph 3 shows disruptive selection, in which the extreme phenotypes are favored over the intermediate.

Answer 2

Answer: In disruptive selection, organisms represented by middle of the curve.

Explanation:

Natural selection that favours extreme values of a characteristic over intermediate values is known as disruptive selection. As a result, a population may have a bimodal distribution of the characteristic, with just a small number of people falling between the two extremes.

Since they are less suited to either extremity of the environment, those with intermediate values in the middle of the curve are at a disadvantage. The individuals at either end of the curve, however, are more fit and more adapted to their respective extremes.

As the two groups with extreme levels for the characteristic become more genetically different over time, disruptive selection might result in speciation. When there is a diverse environment with several niches, each of which favours a distinct extreme value for the characteristic, this process can take place.

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