What is the evolutionary explanation for having two sexes?

February 16, 2009

Andy asks: “What is the evolutionary explanation for having two sexes (man and woman)?” Thanks for the question, Andy!

Sexual reproduction began with simple single-cell organisms (eukaryotes). Since sexual reproduction provides much more genetic variation in a population than asexual reproduction does, it follows that species which could reproduce sexually were able to more quickly evolve in response to environmental changes than species that reproduce only asexually. It was therefore the asexual reproducers who were better able to develop into higher plant and animal forms.


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