Question
Download Solution PDFSequentially arrange the developmental stages of human spermatozoon:
(A) Secondary Spermatocyte
(B) Spermatid
(C) Spermatozoa
(D) Spermatogonia
(E) Primary spermatocytes
Choose the correct answer from the options given below:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
- Spermatogenesis is the process of the production of sperms from the immature male germ cells in testis.
- This process begins at puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH).
- Spermatogenesis occurs within the seminiferous tubules in each testis.
- Both mitosis and meiosis are involved in this process.
Important Points
- Spermatogonia, present on the inner wall of the seminiferous tubules, multiply by mitotic division.
- Each spermatogonium is diploid(2n) and contains 46 chromosomes.
- Some spermatogonia differentiate into primary spermatocyte and periodically undergo meiotic division.
- The primary spermatocyte completes the first meiosis and forms two equal haploid(n) secondary spermatocytes.
- The secondary spermatocytes undergo the second meiotic division to produce four equal haploid(n) spermatid.
- Spermatids are transformed into spermatozoa by the process called spermiogenesis.
- Thus, spermatozoa are also haploid(n) and contains 23 chromosomes.
Therefore, the correct sequence is:
- (D) Spermatogonia
- (E) Primary spermatocytes
- (A) Secondary Spermatocyte
- (B) Spermatid
- (C) Spermatozoa
Hence, the correct answer is option 4.
Last updated on May 15, 2025
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