Question

Identify the cells represented as \(p, q, r\) and \(s\) in the schematic representation of Oogenesis, shown below and choose the correct option.

• A. (p)-Ovum, (q)-Secondary Oocyte, (r)-Primary Oocyte, (s)-Ovum
• B. (p)-Oogonia, (q)-Primary Oocyte, (r)-Secondary Oocyte, (s)-Ovum
• C. (p)-Ovum, (q)-Oogonia, (r)-Primary oocyte, (s)-secondary Oocyte
• D. (p)-Secondary Oocyte, (q)-Primary Oocyte, (r)-Ovume, (s)-Oogonia

Answer 1

The Correct Option is B

p represents the Oogonia. Oogonia are the primordial germ cells that undergo mitotic divisions to increase in number. 
q represents the Primary Oocyte. Oogonia differentiate into primary oocytes, which then enter meiosis I. 
r represents the Secondary Oocyte. After meiosis I, the primary oocyte divides into a secondary oocyte and a first polar body. 
s represents the Ovum. The secondary oocyte undergoes meiosis II to form an ovum (egg cell) and a second polar body.

The correct answer is (B) p - Oogonia, q - Primary Oocyte, r - Secondary Oocyte, s - Ovum.

Answer 2

Oogenesis begins with diploid oogonia (p), which develop into primary oocytes (q) arrested in prophase I until puberty.
Each menstrual cycle, a primary oocyte completes meiosis I to form a secondary oocyte (r) and the first polar body.
Upon fertilization, the secondary oocyte completes meiosis II to become the mature ovum (s).

The correct sequence is (B) p - Oogonia, q - Primary Oocyte, r - Secondary Oocyte, s - Ovum.