Question

Which of the following will have the same ploidy level?

• A. Primary spermatocyte, primary oocyte, and second polar body
• B. Oogonia, primary oocyte, and first polar body
• C. Second polar body, spermatids, and primary spermatocyte
• D. First polar body, secondary oocyte, and spermatozoa

Answer 1

Answer: (D)

In human females, during oogenesis, the diploid structure with $\text{46}$ chromosomes $\left(\text{44+XX}\right)$ is oogonium, which divides mitotically and gives rise to the primary $\text{oocyte }(\text{2n})$ . Secondary oocyte, first and second polar body and ovum are produced as a result of meiotic division, and hence, they are haploid in nature.
In human males, during spermatogenesis, in the diploid structure with 46 chromosomes, 44+XY is spermatogonium, which grows in size and volume and produces to the primary spermatocyte (2n). Secondary spermatocyte, spermatids and spermatozoa are produced as a result of meiotic division and spermiogenesis; hence, they are haploid in nature.