Gender refers to the socially constructed roles, behaviors, activities, and attributes that a given society considers appropriate for boys and men or girls and women. These influence the ways that people act, interact, and feel about themselves. While aspects of biological sex are similar across different cultures, aspects of gender may differ.
American Psychological Association. (2011). Answers to your questions about transgender people, gender identity, and gender expression. Washington, DC: Author. [Retrieved from www.apa.org/topics/lgbt/transgender.pdf.]