Why does meiosis need to occur prior to fertilization?

MeiOSis is essential before fertilization because it reduces the chromosome number by half, creating haploid gametes (sperm and eggs) from diploid germ cells. This ensures that when fertilization occurs, the resulting zygote has the correct diploid number of chromosomes, maintaining genetic stability across generations. Additionally, meiOSis introduces genetic variation through processes like crossing over and independent assortment, which is vital for evolution and adaptation.