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Sex is the biological trait that determines whether an anisogamous sexually reproducing organism produces male or female gametes.[1][2][3] During sexual reproduction, a male and a female gamete fuse to form a zygote, which develops into an offspring that inherits traits from each parent. By convention, organisms that produce smaller gametes (spermatozoa, sperm) are called male, while organisms that produce larger gametes (ova, often called egg cells) are called female.[4] An organism that produces both types of gamete is a hermaphrodite.[2][5]

In non-hermaphroditic species, the sex of an individual is determined through one of several biological sex-determination systems. Most mammalian species have the XY sex-determination system, where the male usuallydo