During reproduction,the chromosome number $(2n)$ reduces to half $(n)$ in the gametes,and the original number $(2n)$ is restored in the offspring. What are the processes through which these events take place?

Constancy of the chromosome number in successive generations is brought about by the process of

In which of the following stages does the centromere not split?

Which of the following statements are correct regarding the importance of meiosis?
$(i)$ It increases the genetic variability in the population of organisms from one generation to the next.
$(ii)$ It decreases genetic variability.
$(iii)$ It occurs in all cells of our body.
$(iv)$ It is an important process for evolution.

The significance of meiosis lies in:

$A$: Meiosis is an important process for evolution. $R$: Crossing over induces genetic variation in a species.