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Sex verification in sports (also known as gender verification, or as gender determination or a sex test) occurs because eligibility of athletes to compete is restricted whenever sporting events are limited to a single sex, which is generally the case, as well as when events are limited to mixed-sex teams of defined composition (e.g., most pairs ...
[6] [7] The term "sex determination" increased in usage after 1900. [8] In the 1960 and early 70's the term "sex assignment" came into prominent use as a colloquially word for "determination of sex" and "sex determination". "Sex assignment" did not occur in writing prior to the 1960's. It is used ~100 times less frequently than "determination ...
The guppy (Poecilia reticulata), also known as millionfish or the rainbow fish, [3] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. [4]
Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadal sex refers to the gonads, that is the testicles or ovaries, depending on which genes are expressed. Phenotypic sex refers to the structures of the external and internal genitalia. [6]
A virginity test is the pseudoscientific practice and process of determining whether a woman or girl is a virgin; i.e., to determine that she has never engaged in, or been subjected to, vaginal intercourse.
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All alligators determine the sex of their offspring by the temperature of the nest. Many other sex-determination systems exist. In some species of reptiles, including alligators, some turtles, and the tuatara, sex is determined by the temperature at which the egg is incubated during a temperature-sensitive period. There are no examples of ...
Sequential hermaphrodites almost always have a sex ratio biased towards the birth sex, and consequently experience significantly more reproductive success after switching sexes. According to the population genetics theory, this should decrease genetic diversity and effective population size (Ne).