Another common cause of being intersex is the crossing over of the SRY from the Y chromosome to the X chromosome during meiosis. Some humans were historically termed true hermaphrodites if their gonadal tissue contained both testicular and ovarian tissue, or pseudohermaphrodites if their external appearance phenotype differed from sex expected from internal gonads. Although they possess ovaries and testes, they have a protective mechanism against self-fertilization. Wrasses also have an uncommon life history strategy, which is termed diandry literally, two males. Mating with a partner is more desirable biologically, as the genetic material of the resultant offspring is varied, but if mating with a partner is not possible, self-fertilization is practiced. The male sexual organ of an adult banana slug is quite large in proportion to its size, as well as compared to the female organ. For instance, groupers are favoured fish for eating in many Asian countries and are often aquacultured. The clownfish genus Amphiprion are colorful reef fish found living in symbiosis with sea anemones. Each has two penises on the undersides of their heads which they use to inject sperm.
For instance, groupers are favoured fish for eating in many Asian countries and are often aquacultured. Intersex is in some caused by unusual sex hormones; the unusual hormones may be caused by an atypical set of sex chromosomes. Individuals are born as males or females, but if they are born males, they are not born as terminal phase males. The series may be the earliest medical photographic documentation of intersex. After mating, the external portion of the penis detaches, but is able to regrow within 24 hours. Usually, the most dominant female or initial phase male replaces any terminal phase male when those males die or abandon the group. They are not territorial. They do not practice self-fertilization, but when they find a mate, the pair takes turns between which one acts as the male and which acts as the female through multiple matings, usually over the course of several nights. Banana slugs are one example of a hermaphroditic gastropod. They are, perhaps, female mimics which is why they are found swimming in group with other females. Lythrypnus dalli Family Lythrypnus are a group of coral reef fish in which bidirectional sex change occurs. Generally one anemone contains a 'harem', consisting of a large female, a smaller reproductive male, and even smaller non-reproductive males. Some humans were historically termed true hermaphrodites if their gonadal tissue contained both testicular and ovarian tissue, or pseudohermaphrodites if their external appearance phenotype differed from sex expected from internal gonads. It is possible for banana slugs, while mating, to become stuck together. Initial phase males do not look like males and spawn in groups with other females. Most species of parrotfish start life as females and later change into males. The SRY is then activated in only certain areas, causing development of testes in some areas by beginning a series of events starting with the upregulation of SOX9 , and in other areas not being active causing the growth of ovarian tissues. Sequential hermaphrodites can be divided into three broad categories: Shells of Crepidula fornicata common slipper shell. Snails typically reproduce in early spring and late autumn. Early observations of spotted hyenas in the wild led researchers to believe that all spotted hyenas, male and female, were born with what appeared to be a penis. The species of colourful sea slugs Goniobranchus reticulatus is hermaphroditic, with both male and female organs active at the same time during copulation. Earthworms are simultaneous hermaphrodites, having both male and female reproductive organs. Terminal phase males are territorial and have a distinctively bright coloration. One possible pathophysiologic explanation of intersex in humans is a parthenogenetic division of a haploid ovum into two haploid ova.
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