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Hermaphrodite sex with self

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The evolutionary origins and consequences of self-fertility in nematodes

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Sex is just as complicated as humans are. From a biological standpoint, the appearance of the external genitalia is only one parameter among many, including chromosomal constitution, the sequence of sex-determining genes, gonadal structure, the profile of gonadal hormones, and the internal reproductive structures.
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The problem is this: many creatures can reproduce by fertilising themselves instead of getting someone else to do it, and at first glance they should do much better individuals that cross-fertilise. And without having to find males, self-fertilising females should be able to produce twice as many offspring. And yet, cross-fertilisation is the more common strategy in the animal world, so it must have advantages that compensate for its cons.
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