i really need help!!! ITS ABOUT MEIOSIS II?

Question

at the end of meiosis II, each of the haploid sex cells has only half the number of chromosomes as the original diploid cell. why is this important?

Answer 1

Think about what would happen if there weren't 1/2 of the number for an organisms that reproduces sexually.

Say, for example, an organism has 12 pairs of chromosomes (24 in all). By having gametes with 1/2 the number of the parent's "other" cells, an egg has 12 and the sperm has 12, so when fertilization happens, the offspring has 24 chromosomes (12 from each parent). This keeps the number the same in each generation.

If, on the other hand, the gametes had the same number of the parents "regular" cells, the egg would have 24 chromosomes and the sperm would as well, so the offspring would have 48 total after fertilization. The number of chromosomes would increase (double) with each generation.

Now, imagine having to do genetics problems for an organism that has 4098 genes for a single trait - two genes per trait is sometimes bad enough!