Testosterone will also control the descending of the testes from the abdomen into the scrotom. Appearance of first ovarian follicles. Hermaphrodite Intersex Disorders of sex development Sex reversal.
Menarche Menstruation Follicular phase Ovulation Luteal phase. For example, some studies claim girls are, on average, more verbally fluent than boys, but boys are, on average, better at spatial calculation. Advertisement Hide. Human physiology of sexual reproduction. Washington, D.
External link. The production of sex hormones can result solely from genetics or from genetics in combination with the influence of environmental factors. Sex-determining mechanisms in reptiles are broadly divided into two main categories: genotypic sex determination GSD and temperature-dependent sex determination TSD.
The next phase can be either male or female, depending on the animal's position in the mound. In most species, gender is determined during fertilization.
Menarche Menstruation Follicular phase Ovulation Luteal phase. Cengage Learning; 10 October [cited 17 June ]. In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome, the type of gonads , the sex hormones , the internal genitalia such as the uterus in females , and the external genitalia.