Hermaphrodite - Simultaneous Hermaphrodism, Sequential Or Serial Hermaphrodites, Hermaphrodism In Humans
male female time animals
A hermaphrodite is any organism with both male and female reproductive organs which produce both male gametes (sperm) and female gametes (ova). In some animals, the simultaneous hermaphrodites, both male and female organs are functional at the same time. In other animals, the sequential hermaphrodites, one sex develops at one time, which later develops into the other sex. Examples of both strategies are found naturally, especially in the invertebrates, and for many creatures, hermaphrodism is the only method of reproduction.
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Sponges, sea anemones, tapeworms, snails, and earthworms are all simultaneous hermaphrodites possessing both male and female reproductive organs at the same time. These animals are either sedentary species (remaining in one place all their life) or they are mobile, but do not range widely. These habits present problems for sexual reproduction and mating, for individuals rarely meet others of their…
A few species of vertebrates (mostly fish), and some species of crustaceans (barnacles and shrimps) change sex during their lifetime. Sequential hermaphroditic fish, such as the bluehead wrasse, undergo protogyny, changing sex from female to male. Other species, such as the sea perch, Pagellus acurne, undergo protandry, changing sex from male to female. A third group of fish, such as the sea bass,…
True hermaphroditic humans do not exist, but pseudohermaphrodism does, where an individual has both male and female external genital organs, sometimes at the same time. Female embryos exposed to high levels of androgens (the male hormones) develop female internal reproductive organs but male external genitalia. Alternately, genetic defects cause children to be born with female external genital org…
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