The secondary oocyte then undergoes meiosis 2 which arrests at metaphase and will not continue without fertilization. Ovulation releases this oocyte from the ovary. In males, sperm continues to be generated throughout life from a stem cell population in the testis. In males, 2. 3. See large image with labels See large image with labels See large image with labels Sex Determination Summary Mammalian sex determination is regulated by chromosomes.
Females have two X chromosomes.
The X and Y chromosome are morphologically and functionally different from each other. It is only in the last 5 years that we have some idea about how these two types of chromosomes may be regulated and genes of inportance located upon them. In females the main scientific problem was that of gene dosage, only one copy of X chromosome is needed to be active. XY male genotype About Notes Notes from the Embryology Program compiled and written by Dr Mark Hill.