She may have been ruler of Egypt in her own right. A fetus usually develops into a male if it is exposed to a significant amount of testosterone typically because the fetus has a Y chromosome from the father. In terms of biology , the female sex organs are involved in the reproductive system, whereas the secondary sex characteristics are involved in nurturing children or, in some cultures, attracting a mate. Because humans inherit mitochondrial DNA only from the mother's ovum, genetic studies of the female line tend to focus on mitochondrial DNA. History The earliest women whose names are known through archaeology include: The vagina is used in copulation and birthing, although the term vagina is often colloquially and incorrectly used in the English language for the vulva or external female genitalia, which consists of in addition to the vagina the labia , the clitoris , and the female urethra. In some cases, even if a child had XX chromosomes, if they were born with a penis, they were raised as a male. The ovaries , in addition to their regulatory function producing hormones, produce female gametes called eggs which, when fertilized by male gametes sperm , form new genetic individuals. Note that both models have partially shaved body hair. There are various words used to refer to the quality of being a woman. Other known pre-Sargonic queens of the first Lagash dynasty include Menbara-abzu, Ashume'eren, Ninkhilisug, Dimtur, and Shagshag, and the names of several princesses are also known.