Biology- genes unit

Question

Why does meiosis need two nuclear divisions to produce four haploid cells from a single diploid nucleus? 

Answer 1

Meiosis I produces two haploids when the pairs of homologous chromosomes separate. When the sister chromatids of each pair pull apart during Meiosis II, the result is four haploid cells. Having two rounds of meiosis allows gametes to fuse during fertilization and yield zygotes with the same number of chromosomes and DNA molecules as a diploid parent cell in G1 phase of the cell cycle.