Why does asexual reproduction result in more genetic diversity than sexual reproduction?

Why does asexual reproduction result in more genetic diversity than sexual reproduction?
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In asexual reproduction there are 2 daughter cells produced thatare identical to the parent cell. In sexual reproduction there are4 genetically different daughter cells produced that are haploid(23 chromosomes). Crossing over occurs during meiosis which mixesup segments of DNA on homologous chromosomes causing new geneticvariations. By the sperm fertilizing the egg, you are combining 2completely different sets of different haploid DNA to produce adiploid offspring which is genetically different from bothparents.
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