Which of the following statement pertaining to oogenesis are true?
a. one primary oocyte containing 46 chromosome will yield one ova containing 23 chromosomes
b. ovulation releases a secondary oocyte that has completed both phases of meiosis
c. oogenesis begns when the female is still a fetus within her mother's womb
d. the first meiotic division involved in oogenesis is completed just prior to ovulation
e. during oogenesis, there is unequal distribution of the cytoplasm resulting in the production of polar bodies that disintegrate

The correct statements are a, c, and e.

Explanation:

Oogenesis is the process by which ovum or female gamete is formed.

The process of oogenesis initiates in a female during her fetal stages. During embryonic stage, the oogonium (2n) or stem cells divide and mature into primary oocyte (2n) with the help of mitotic division.

Primary oocyte starts its meiotic division but gets arrested in prophase I stage before birth. After puberty, one oocyte resumes the division each month till menopause.

The primary oocyte completes the first meiotic division and produce secondary oocyte (n) and one polar body. The polar body is usually small in size and gets degenerated with time. It may or may not complete its meiosis II.

The first meiotic division is usually completed one day before ovulation (not just prior to ovulation).

Secondary oocyte is released during ovulation. It undergoes meiosis II but gets arrested in metaphase II. It does not complete its meiosis II until fertilized by a sperm.

Once, sperm penetrates the secondary oocyte, it resumes and completes its second division. It releases second polar body which also gets degenerated.

Thus, the correct statements are a, c, and e.

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