Question

In a population, a group or individual of similar phenotypes are forced due to differential reproduction due to.
A. Genetic drift
B. Natural selection
C. Migration
D. Selective Hybridization

Answer 1

Hint: Differences in two individuals of the population is caused by different alleles or genes which is known as polymorphism and the population variation is due to the distribution of phenotypic individuals, which are affected by various factors such as environment and population genetic makeup.

Complete answer:
> Option A:
Genetic variance is the variety in the alleles and genotype within a population. Genetic drift is the responsible factor, which shows similar phenotype individuals in a population. In genetic drift, the population allele and genotype frequencies can change, which is the effect of chance. Small populations show more frequently genetic drift, while large populations are buffered by its large size or effects of chance, genetic drift is magnified by natural events.

> Option B:
Natural selection: It is the process by which living population adapt to its particular environment by making changes in itself, which is a necessary process for the survival, it is a slow process, those brig changes are different from their ancestor due to of adaptive feature, this change may be caused by due to geographical isolation, reproductive isolation. Darwin proposed the theory of natural selection.

> Option C:
Migration: It is the movement of a living being from one place to another place in search of food, habitat, shelter and reproduction. Apart for this migration is also act as adaptation feature for those organisms who can not survive in extreme condition, so they will migrate toward favourable environmental condition, such migratory Siberian bird migrates to India in the winter season, during winter Siberia temperature drop so much that birds not able to live in that temperature so they migrate toward India.

> Option D:
Selective hybridization: It is the artificial process of fertilization between two desired individuals to obtain the desired character to fully fill the requirement.

Hence, the correct answer is option (A).

Note: The change in genetic material is a necessary process to bring the change in population for the survival process and pass to the upcoming generation. The change is a natural process and those changes occur due to natural selection which is a slow process, which brings the variation in a population.