Question

What is the correct sequence of sperm formation?

• A. Spermatogonia, Spermatozoa, Spermatocytes, Spermatids
  
• B. Spermatogonia, Spermatocytes, Spermatozoa, Spermatids
  
• C. Spermatogonia, Spermatocytes, Spermatids, Spermatozoa
  
• D. Spermatids, Spermatocytes, Spermatogonia, Spermatozoa
  

Answer 1

The correct option is C Spermatogonia, Spermatocytes, Spermatids, Spermatozoa


Spermatogenesis
Spermatogenesis is the process of formation of sperm from spermatogonia in the testes of males.

Process of spermatogenesis

1. Spermatogenesis starts at puberty. It involves three phases:
2. Multiplication phase - Primordial germ cells present in the walls of the seminiferous tubule undergo mitosis to form more spermatogonia.
3. Growth phase - Some spermatogonia increase in cell size and volume and are referred to as primary spermatocytes. Both spermatogonia and primary spermatocytes are diploid and contain 46 chromosomes.
4. Maturation phase - Primary spermatocytes (46) undergo first meiotic division (reduction division) to produce two secondary oocytes. Thus, secondary spermatocytes have 23 chromosomes.
5. Secondary spermatocytes undergo a second meiotic division to form four spermatids (23).

Spermatids undergo cell differentiation and produce sperms.

Pictorial representation of spermatogenesis
Pictorial representation of the process of spermatogenesis:



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

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