Question

Which among the following is haploid in nature?

• A. Spermatogenic cell
• B. Spermatogonia
• C. Primary spermatocytes
• D. Secondary spermatocytes

Answer 1

The correct option is D Secondary spermatocytes

The process of formation of sperms is known as spermatogenesis.

Spermatogenic cells or primordial germ cells or male germ cells which are diploid (2n) in nature undergo repeated mitotic divisions and produce a large number of spermatogonia which is also diploid (2n).
Some spermatogonia become primary spermatocytes (2n) by almost doubling their size through the accumulation of cytoplasm and replication of DNA. So up to this level of growth and multiplication, the cells are diploid. Soon after these primary spermatocytes undergo two successive maturation division- First meiotic division of primary spermatocyte gives rise to haploid (n) secondary spermatocyte. This haploid secondary spermatocyte then undergoes a quick second maturation division (equational division/meiosis II) to produce a total of four haploid spermatids.

A spermatid is a non-motile cell and it undergoes a process of transformation called spermiogenesis to develop into spermatozoa.