EVERYDAY SCIENCE

Detailed explanation-1: -I) Directional selection occurs when natural selection favours one extreme of continuous variation. II)Disruptive selection occurs when natural selection favours both extremes of continuous variation.

Detailed explanation-2: -Diversifying (or disruptive) selection: Diversifying selection occurs when extreme values for a trait are favored over the intermediate values. This type of selection often drives speciation. Diversifying selection can also occur when environmental changes favor individuals on either end of the phenotypic spectrum.

Detailed explanation-3: -In directional selection, one extreme of the trait distribution experiences selection against it. The result is that the population’s trait distribution shifts toward the other extreme. In the case of such selection, the mean of the population graph shifts.

Detailed explanation-4: -In population genetics, directional selection, is a mode of negative natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.

Detailed explanation-5: -Disruptive Selection. Disruptive or diversifying selection is a means of natural selection that favors the extreme values of a trait as compared to the intermediate ones. It acts against the average individuals in a population.