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Two hermaphrodites having sex

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    For example, the great majority of tunicates , pulmonate snails, opisthobranch snails , earthworms , and slugs are hermaphrodites. Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. Most plants are also hermaphrodites. Historically, the term hermaphrodite has also been used to describe ambiguous genitalia and gonadal mosaicism in individuals of gonochoristic species, especially human beings. The word intersex has come into usage for humans, since the word hermaphrodite is considered to be misleading and stigmatizing , [3] [4] as well as "scientifically specious and clinically problematic.
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    Two Hermaphrodites Having Wild Sex

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    Two Hermaphrodite having Sex - mnemerge.com

    All rights reserved. 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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    Photos: Bizarre Sex Lives of Hermaphrodite Sea Slugs

    By harboring male and female functions in the same genome and expressing them in every individual, simultaneous hermaphrodites may incur sexual conflict unless both sex functions can evolve phenotypic optima independently of each other. The first step toward understanding their capacity to do so lies in understanding whether sex functions are phenotypically correlated within individuals, but remarkably few data address this issue. We tested the potential for intra- and intersex covariation of gamete phenotypes to mediate sexual conflict in broadcast-spawning hermaphrodites the ascidians Ciona intestinalis and Pyura praeputialis , for which sex-specific selection acts predominantly on sperm—egg interactions in the water column. In both species, gamete phenotypes covaried within and across sex functions, implying that selection may be unable to target them independently because its direct effects on male gametes translate into correlated effects on female gametes and vice versa. This alone does not preclude the evolution of a different phenotypic optimum for each sex function, but imposes the more restrictive requirement that selection — which ultimately sorts among whole individuals, not sex functions — aligns with the direction in which gamete phenotypes covary at this level.
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