Natural Selection:
At group level selection, that is how sex was evolved. (Sex evolved because it increased the overall fitness of the group)
Advantage to evolution of sex is to the POPULATION
Why? Increase variation in offspring, speeds the rate of evolution, and allows the removal of deleterious alleles (removes bad genes).
Disadvantage happens at an individual level.
Why? Because hard to find mate and two fold cost of mating.
Interesting....
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