because during the prenatal stage - boys and girls are formed the same inside the mothers wombs.
Girls need two ovaries, which form two testicles when the fetus becomes a boy.
The medical term for hormone produced by the testis is testosterone. This is a hormone that is produced by males and is responsible for various functions in males.
The testis in males mature during puberty. In females it is the ovaries that mature.
In males, the scrotum holds the testis. In puberty the testis grow in size and so the scrotum also grows bigger.
Spermatogenesis starts at puberty in everyone . This is because the testis become mature.
For males, there is increase in size of testis. For females there is onset of menstruation.
Meiosis is cell division of the germ cells, the egg and sperm. It occurs in the ovary in females and testis in males.
There is an increase in the size of the testis in males. There is onset of menstruation in girls.
In males, the testis get bigger. In females, there is menstruation. Also the overall body growth is huge.
That is because the hormone responsible is testosterone. This hormone is produced by the testis and in males the hormone levels are really high in puberty.
Two: Testosterone and Inhibin.
1- Undescended testis 2- Ectopic testis 3- Atrophic testis 4- Retractile testis 5- Surgically removed testis
sperm production and testosterone production