Question

Pick the odd one out with reference to the ploidy level of the cells.

• A. Sperms
• B. Spermatogonia
• C. Spermatids
• D. Spermatozoa

Answer 1

The correct option is B Spermatogonia

All spermatogenic cells or primordial germ cells undergo repetitive division to produce a large number of spermatogonia that are diploid (2n) in nature. Some spermatogonia stop dividing and grow in size by replicating DNA and accumulating cytoplasm, these are called primary spermatocytes and are diploid (2n). These diploid cells undergo two successive maturation divisions.
The primary spermatocytes undergo the first round of maturation division giving rise to two haploid daughter cells called secondary spermatocytes (n). Each secondary spermatocytes now undergoes a second maturation division, giving rise to four haploid spermatids(n).

By the process of spermiogenesis, these spermatids mature into spermatozoa. So, other than spermatogonia all three cells (sperm, spermatids, spermatozoa) are haploid in nature.