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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.Sequential hermaphrodites can be divided into three broad categories: Dichogamy can have both conservation-related implications for humans, as mentioned above, as well as economic implications.In these groups, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the "female" or "male".For example, the great majority of tunicates, pulmonate snails, opisthobranch snails and slugs are hermaphrodites.Sequential hermaphroditism is common in fish (particularly teleost fish) and some jellyfish, many gastropods (such as the common slipper shell), and some flowering plants.Sequential hermaphrodites can only change sex once.Another common cause of being intersex is the crossing over of the SRY from the Y chromosome to the X chromosome during meiosis.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).

It can be difficult to determine the sex of wild spotted hyenas until sexual maturity, when they may become pregnant.

Hermaphroditism is also found in some fish species and to a lesser degree in other vertebrates. 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 preferred usage for humans, since the word hermaphrodite is considered to be misleading and stigmatizing, Since the estimated total number of animal species is 8.6 million, the percentage of animal species that are hermaphroditic is about 0.7%.

Arthropods are the phylum with the largest number of species.

Most hermaphroditic species exhibit some degree of self-fertilization.

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