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X chromosome the sex chromosome found in both males and females. Females typically have two X chromosomes; males typically have one. An X chromosome from each parent produces a female child.
Y chromosome the sex chromosome typically found only in males. When paired with an X chromosome from the mother, it produces a male child.
testosterone the most important male sex hormone. Both males and females have it, but the additional testosterone in males stimulates the growth of the male sex organs during the fetal period and the development of the male sex characteristics during puberty.
primary sex characteristics the body structures (ovaries, testes, and external genitalia) that make sexual reproduction possible.
secondary sex characteristics nonreproductive sexual traits, such as female breasts and hips, male voice quality, and body hair.
spermarche the first ejaculation.
menarche the first menstrual period.
Intersex a condition present at birth due to unusual combinations of male and female chromosomes, hormones, and anatomy; possessing biological sexual characteristics of both sexes.
AIDS a life-threatening, sexually transmitted infection caused by the human immunodeficiency virus (HIV). AIDS depletes the immune system, leaving the person vulnerable to infections.
sexual orientation our enduring sexual attraction, usually toward members of our own sex (homosexual orientation) or the other sex (heterosexual orientation); variations include attraction toward both sexes (bisexual orientation).
Created by: 23ghaiduk
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