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During spermatogenesis, 4,500 spermatogonia are induced. Each spermatogonium gives rise to one primary spermatocyte; each primary produces two secondary spermatocytes; each secondary forms two spermatids; each spermatid differentiates into a mature spermatozoon. How many mature spermatozoa are produced?

hard 3 marks Class 12 · Biology · Human Reproduction
Answer
18,000 mature spermatozoa

The correct answer is 18,000 mature spermatozoa — Thus, 18,000 mature sperm cells are produced.

Step-by-step solution

  1. Start with 4,500 spermatogonia.
  2. Each spermatogonium yields 1 primary spermatocyte → 4,500 primaries.
  3. Each primary produces 2 secondary spermatocytes → 4,500 × 2 = 9,000 secondaries.
  4. Each secondary yields 2 spermatids → 9,000 × 2 = 18,000 spermatids.
  5. Each spermatid becomes 1 mature sperm → 18,000 mature spermatozoa.
  6. Thus, 18,000 mature sperm cells are produced.
Common mistake: Assuming each secondary gives 1 spermatid, doubling the final count

Concept tested: Spermatogenesis yield

Published · How this solution was prepared and checked

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