Why does meiosis occur?

Do you mean “how?” “Why”is because of sexual reproduction. Individuals of each gender need to create sex cells that will contain half of their offspring's DNA, and this is the process that creates those cells. read more

Meiosis occurs in diploid cells. The chromosomes duplicate once, and through two successive divisions, four haploid cells are produced, each with half the chromosome number of the parental cell. Meiosis occurs only in sexually reproducing organisms. read more

A: Quick Answer. Meiosis in humans happens before birth in females, and constantly after puberty in males. read more