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Why sex evolution

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    Laurence D. The reason why, in terms of evolution, organisms have sex may seem rather obvious — they do it to reproduce. But this is missing the point. For many species there is an alternative: asexual reproduction. So why has sex evolved in so many species?
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    Why Sex? Biologists Find New Explanations.

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    Evolution of sexual reproduction - Wikipedia

    The slipper-shaped protozoan Paramecium reproduces sexually under stressful conditions but does not seem to derive much genetic diversity from it. The downsides of relying on sex to reproduce are undeniable: It takes two individuals, each of whom gets to pass on only part of their genome. Because these individuals generally have to get fairly intimate, they make themselves vulnerable to physical harm or infections from their partner. Asexual reproduction, or self-cloning, has none of these disadvantages. Yet despite all its benefits, asexual reproduction is the exception, not the norm, among organisms that have compartmentalized cells eukaryotes.
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    Sexual Reproduction and the Evolution of Sex

    This page has been archived and is no longer updated. Birds do it, and bees do it. Indeed, researchers estimate that over
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    The evolution of sexual reproduction is an adaptive feature which is common to almost all multi-cellular organisms and also some single-cellular organisms with many being incapable of reproducing asexually. Prior to the advent of sexual reproduction , the adaptation process whereby genes would change from one generation to the next genetic mutation happened very slowly and randomly. Sex evolved as an extremely efficient mechanism for producing variation, and this had the major advantage of enabling organisms to adapt to changing environments. Sex did, however, come with a cost. In reproducing asexually, no time nor energy needs to be expended in choosing a mate.
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