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I RECENTLY REVIEWED some of the advantages and disadvantages of sexual and asexual reproduction. Sexual reproduction is thought to be chiefly useful in the elimination of negative mutations, while these build up in asexually reproducing lineages. Without some type of genetic recombination it is thought that asexual reproduction will lead eventually to extinction.
AMONG EUKARYOTES, sexual reproduction is more common than asexual reproduction, and often organisms that reproduce asexually also have a supplementary means of sexual reproduction. While sexual reproduction does have some drawbacks, it appears that in general the benefits outweigh these.