Question

In human beings, during oogenesis, Meiosis-I results into ___________.

• A. A haploid large-sized secondary oocyte and a haploid smaller polar body
• B. A haploid large-sized primary oocyte and a haploid smaller polar body
• C. A diploid large-sized primary oocyte and a haploid small-sized polar body
• D. A haploid large-sized secondary oocyte and a diploid smaller polar body

Hint:

Unequal cytokinesis during oogenesis ensures most cytoplasm is retained in the ovum.

Answer 1

The Correct Option is A

Step 1: Understanding oogenesis.
Oogenesis is the process of formation of female gametes in human beings and involves two meiotic divisions.
Step 2: Outcome of Meiosis-I.
During Meiosis-I, the primary oocyte divides unequally to form a large haploid secondary oocyte and a small haploid first polar body.
Step 3: Analysis of options.
(A): Correct — matches the actual outcome of Meiosis-I.
(B): Incorrect — primary oocyte is diploid, not haploid.
(C): Incorrect — primary oocyte does not remain diploid after meiosis.
(D): Incorrect — polar body is haploid, not diploid.
Step 4: Conclusion.
Meiosis-I in oogenesis results in a haploid large-sized secondary oocyte and a haploid smaller polar body.