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Two aspects of biological sex are chromosomes (XX for female, XY for male) and reproductive anatomy (ovaries and uterus for female, testes and penis for male).
Look up the SRY gene located on the sex chromosomes. The SRY gene when turned on in epistatis controls that.
Haploid cells are "sex cells" that are found in the ovaries or testes of a sexually reproducing organism. Sex Cells.
Testes
It isn't different. Both parents give half of their chromosomes to their offspring.
If you're a mammal, the key gene that initiates gonad development into testes (the Sry gene) is located on the Y chromosome. However, be aware that while gene necessary for the initiation of the male developmental program is located on the Y chromosome, many genes absolutely essential for complete testes and male development are distributed across many other chromosomes.
Testicles is the synonym for testes.
Females do not have testes. Testes are male reproductive organs. The female equivalent of testes is ovaries, which produce eggs and female sex hormones.
The scrotum is the pouch of skin containing the testes. It is divided into two parts and also contains the epididymides and the lower sections of the spermatic cords.
The testes produce spermatozoa (sperm).