Sex
Many species of living things are divided into two or more categories called sexes. These refer to complementary groups that combine genetic material in order to reproduce, a process called sexual reproduction. Typically, a species will have two sexes: male and female.In mammals (and many other species) sex is determined by the sex chromosomes, called X and Y. For mammals, males typically have one of each (XY), while females typically have two X chromosomes (XX). All individuals have at least one X chromosome, the Y chromosome is generally shorter than the X chromosome with which it is paired, and is absent in some species. In humans, sex is conventionally perceived as a dichotomous state or identity for most biological purposes, such that a person can only be female or male.
Gender
Gender is the socially constructed component of human sexuality. Gender is an inner feeling that you are male, female, both, neither, or somewhere in between. Perhaps the best way to understand gender is to understand it as a process of social presentation. Because gender roles are delineated by behavioral expectations and norms, once individuals know those expectations and norms, the individual can adopt behaviors that project the gender he/she wishes to portray. One can think of gender like a role in a theatrical play - there are specific behaviors and norms associated with genders just like there are lines and movements associated with each character in a play. Adopting the behaviors and norms of a gender leads to the perception that someone belongs in that gender category. Gender roles are, unlike sex, mutable, meaning they can change. Gender is not, however, as simple as just choosing a role to play but is also influenced by parents, peers, culture, and society.
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