Amazon Fish Challenges Theory of Evolution’s Mutation Idea

(From BBC News)

Evolutionary theory suggests that species favouring asexual reproduction will rapidly become extinct, as their genomes accumulate deadly mutations over time.

But a study on an Amazon fish has cast doubt on the rapidity of this decline.

Despite thousands of years of asexual reproduction, the genomes of the Amazon molly fish are remarkably stable and the species has survived.

Details of the work have been published in Nature Ecology and Evolution.

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