Question

Which is the correct sequence in spermatogenesis?

• A. Spermatogonia → Spermatids → Secondary spermatocytes → Primary spermatocyte → Sperm
  
• B. Spermatogonia → Primary spermatocytes → Secondary spermatocytes → Spermatids → Sperms
  
• C. Spermatogonia → Spermatids → Primary spermatocytes → Secondary spermatocytes → Sperms
  
• D. Primary spermatocytes → Secondary spermatocytes
  → Spermatids → Spermatogonia → Sperms
  

Answer 1

The correct option is B Spermatogonia → Primary spermatocytes → Secondary spermatocytes → Spermatids → Sperms


Spermatogenesis
Spermatogenesis is the formation of sperm from the primordial germ cells in seminiferous tubules of testis.

Fate of spermatogonia
Primordial germ cells present in the walls of the seminiferous tubule undergo mitosis to form more spermatogonium. The spermatogonia multiply by mitotic division and increase in number. Some spermatogonia increase in cell size and volume and are referred to as primary spermatocytes.

Fate of primary spermatocyte
Primary spermatocyte with diploid chromosome number (46) undergoes meiosis I and forms secondary spermatocytes with haploid chromosome number 23.

Fate of secondary spermatocyte
Secondary spermatocytes with haploid chromosome number (23) complete meiosis II and form spermatids.

Fate of spermatid
Spermatid is the immature sperm which undergoes cell differentiation and transforms into a mature spermatozoa.

Formation of cells in spermatogenesis
The sequence of formation of cells in spermatogenesis is as follows:


Spermatogonia → Primary spermatocytes → Secondary spermatocytes → Spermatids → Sperms.