The two sexes exist for sexual reproduction. In meiosis, which
is more complicated than it used to be, the two strands of genes
that form the double helix in the nucleus of a cell separate into
two haploid cells, which eventually are ready to recombine with
a haploid cell from a sexual partner to begin the life of a new
human being. Meiosis scrambles the genes so that new humans have
unique sets of genes.
Without two sexes there would be no new people. -- BowTie
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