Question

Assertion :Only a single functional female gamete is formed from each primary oocyte cell. Reason: Meiosis in each primary oocyte gives rise to only one cell, which functions as ovum.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

In oogenesis, diploid oogonium develops into a primary oocyte by mitosis cell division but then arrest. It will finish this division as it develops in the follicle, giving rise to a haploid secondary oocyte and a smaller polar body by meiosis. Secondary oocyte again divides by second meiotic division and again give rise to two unequal sized cell. Larger of these two is known as ovum and smaller one is called as a second polar body. sometimes first polar body also divides simultaneously with secondary oocyte and give rise to two polar bodies. Thus in a complete oogenesis, three polar bodies and one functional female gamete or ovum through a meiotic division are formed. Thus, the correct answer is option B.