Explain creation of diversity over succeeding generation.

Explanation

Variations do appear during reproduction of diversity over whether organisms multiply asexually or sexually.
`rarr` Heredity involves inheritance of basic body design, as well as subtle changes in it from one generation to the next generation.
`rarr` The second generation will have differences that they inherit from the first generation, as well as newly developed differences.

As shown in diagram, the original organism at the top will give rise two individuals /bacteria through asexual reproduction. Both similar in body design, but with subtle differences.
Resultant two individuals/bacteria divide again, each of them, in turn, will give rise two individuals in the next generation.
Each of four individuals will be different from each other.
In this way, large number of individuals are formed after many generations. While some of these differences will be unique, others will be inherited from their respective parents, who were different from each other.
The differences between them, are generated due to small inaccuracies in DNA copying. Thus, variation is accumulated each generation during reproduction which gives rise to diversity.