This is because of independent assortment at metaphase, crossing over at prophase I, and also, sexual reproduction occurs between two gametes each with different genetic material. There's random mating and also random fertilization (which sperm gets the egg).
Meiosis creates greater genetic variation than asexual reproduction due to independent assortment, crossing over, and random fertilization. These processes result in unique combinations of chromosomes and genes in offspring. Asexual reproduction, on the other hand, relies mainly on mutations, which limit genetic diversity.
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