Generally one anemone contains a 'harem', consisting of a large female, a smaller reproductive male, and even smaller non-reproductive males. Individuals are born as males or females, but if they are born males, they are not born as terminal phase males. Clownfish are initially male; the largest fish in a group becomes a female. 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. This language has fallen out of favor due to misconceptions and pejorative connotations associated with the terms,  and also a shift to nomenclature based on genetics. After mating, the external portion of the penis detaches, but is able to regrow within 24 hours. 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. Snails typically reproduce in early spring and late autumn.
Snails typically reproduce in early spring and late autumn. The apparent penis in female spotted hyenas is in fact an enlarged clitoris, which contains an external birth canal. 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. Terminal phase males are territorial and have a distinctively bright coloration. 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. Ghiselin  which states that if an individual of a certain sex could significantly increase its reproductive success after reaching a certain size, it would be to their advantage to switch to that sex. 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. Individuals are born as males or females, but if they are born males, they are not born as terminal phase males. Intersex is in some caused by unusual sex hormones; the unusual hormones may be caused by an atypical set of sex chromosomes. In these species, two male morphs exists: 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. Reproductive system of gastropods: The populations are generally changing sex at a smaller size, due to natural selection. Simultaneous hermaphrodites[ edit ] Turbellarians mating by penis fencing. If a substantial amount of wiggling fails to separate them, the male organ will be bitten off using the slug's radula , see apophallation. After exchange of spermatozoa , both animals will lay fertilized eggs after a period of gestation; then the eggs will proceed to hatch after a development period. Once a social hierarchy is established a fish changes sex according to its social status, regardless of the initial sex, based on a simple principle: Generally one anemone contains a 'harem', consisting of a large female, a smaller reproductive male, and even smaller non-reproductive males. Lythrypnus dalli Family Lythrypnus are a group of coral reef fish in which bidirectional sex change occurs. Where the organism is born as a female, and then changes sex to a male. Most species of parrotfish start life as females and later change into males. Another common cause of being intersex is the crossing over of the SRY from the Y chromosome to the X chromosome during meiosis. They are, perhaps, female mimics which is why they are found swimming in group with other females. Since the adults take several years to change from female to male, the broodstock are extremely valuable individuals. This language has fallen out of favor due to misconceptions and pejorative connotations associated with the terms,  and also a shift to nomenclature based on genetics. For instance, groupers are favoured fish for eating in many Asian countries and are often aquacultured. These fish are simultaneous hermaphrodites.
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