Question

Arrange the following stages of oogenesis in order of their occurrence:
(A) Ovum
(B) Oogonia
(C) Primary oocyte
(D) Secondary oocyte
Choose the correct answer from the options given below:

• A. (C), (B), (D), (A)
• B. (B), (C), (D), (A)
• C. (D), (C), (A), (B)
• D. (A), (D), (C), (B)

Answer 1

The Correct Option is B

To establish the proper sequence of oogenesis stages, definitions of each stage are provided:

• Oogonia (B): These are the primordial germ cells within the ovaries. They undergo mitotic proliferation during fetal development.
• Primary oocyte (C): Oogonia differentiate into primary oocytes, which commence meiosis but remain arrested in prophase I until puberty.
• Secondary oocyte (D): During maturation and ovulation, certain primary oocytes restart meiosis, producing secondary oocytes. This stage is arrested at metaphase II, awaiting fertilization.
• Ovum (A): This represents the mature egg cell, which is only produced if the secondary oocyte successfully completes meiosis II following fertilization.

The natural biological progression of oogenesis stages is as follows:

1. Oogonia (B)
2. Primary oocyte (C)
3. Secondary oocyte (D)
4. Ovum (A)

Consequently, the correct order is: (B), (C), (D), (A)