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Question

Secondary spermatocytes undergo second meiotic division during spermatogenesis to produce

A
Spermatozoa
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B
Haploid spermatids
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C
Primary spermatocytes
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D
Spermatogonia
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E
Diploid spermatids
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Solution

The correct option is B Haploid spermatids
Spermatogenesis
Spermatogenesis is the process of formation of sperm from spermatogonia in the testes of males.

Process of spermatogenesis
Spermatogenesis starts at puberty. It involves three phases:
  1. Multiplication phase - Primordial germ cells present in the walls of the seminiferous tubule undergo mitosis to form more spermatogonia.
  2. 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.
  3. Maturation phase - Primary spermatocytes (46) undergo first meiotic division (reduction division) to produce two secondary oocytes. Thus, secondary spermatocytes have 23 chromosomes.
  4. Secondary spermatocytes undergo a second meiotic division to form four spermatids (23).
  5. Spermatids undergo cell differentiation and produce sperms.
Pictorial representation of spermatogenesis
Pictorial representation of the process of spermatogenesis:



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