Why is the difference between meiosis and mitosis important?
If we didn’t have meiosis, and everything reproduce purely by mitosis all cells would largely be clones of one another, and there would be no real genetic variation. Also, there would be a chromosome imbalance – meiosis is needed to create cells with half the normal amount of genetic info, so that it can fuse with another cell containing half, and bingo there is your zygote.