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Sex and the speed of evolution

Ilan Eshel suggested that sex prevents rapid evolution. He suggests that recombination breaks up favourable gene combinations more often than it creates them, and sex is maintained because it ensures selection in longer-term than in asexual populations - so the population is less affected by short-term changes. This explanation is not widely accepted, as its assumptions are very restrictive.

Nevertheless, it has recently been shown in experiments with Chlamydomonas algae that sex can remove the speed limit on evolution. ^[17]

Source from : http://en.wikipedia.org/wiki