Question

The ovum released from human ovary contains:
A. One X chromosome
B. One Y chromosome
C. Two X chromosome
D. XY chromosome

Answer 1

Hint: The liberation of the ovum from the ovaries implies ovulation. This occurrence occurs in humans when the ovarian follicles break and release the ovarian secondary oocyte cells. The egg would be available to be fertilized by sperm after ovulation, during the luteal process.

Complete answer:
> A layer of cells (germinal epithelium) covers the outer layer of each ovary; these surround the immature egg cells that are present in the ovaries from the moment of birth. The follicle, a hollow ball of cells, encompasses each ovum. The ovum in due course matures within the follicle. A follicle requires about four months developing once it is triggered.
> The ovum itself has a central nucleus which contains the genetic material of the female; this decides the child's inherited characteristics with the genetic material in the sperm cell. A cell plasma, or yolk, is surrounding the nucleus, containing nutritional elements vital to the developing egg cell.
Two X chromosomes produce an ovum released from the human ovary. The eggs are produced by meiosis.

So, the correct answer is “Option C”.

Note: Throughout ovulation, under activation of gonadotropic hormones produced by the pituitary gland, the luteinizing hormone and the follicle-stimulating hormone, a follicle (a small cavity in the ovary) expels the egg. The sex hormones oestrogen and progesterone are secreted by the remainder of the follicle, or the corpus luteum. It governs menstruation and regulates the growth of sex organs.