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They now plan to study the two echidna species to see if they use the same system. So what is the advantage of having so many sex.

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The platypus isn't just weird for being duck-billed, venomous and a mammal that lays eggs—it has weird genetics too. Most mammals have two.

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Little is known about the gene content of the 10 platypus sex chromosomes, but and snakes (the latter having an unrelated ZZ:ZW system) (Matsubara et al. Given the ubiquity of this mode of reproduction, in particular among animals, one might think that dioecy — having separate males and females —.

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