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2.Human Reproduction
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Which of the following cells during gametogenesis is normally diploid ?
A
Spermatogonia
B
Secondary polar body
C
Primary polar body
D
Spermatid
(NEET-2015)
Solution
(a) : Spermatogonia are diploid cells which mature into primary spermatocytes $(2n)$ by growth. They then produce two haploid secondary spermatocytes by meiosis $I$. Each secondary spermatocyte $(n)$ completes the meiosis II and produces two spermatids $(n)$. Each spermatid $(n)$ develops into a spermatozoan or sperm $(n)$. Similarly, in females, oogonia are the diploid cells from which through meiosis, polar bodies $(n)$ and single ovum $(n)$ are produced.
Standard 12
Biology
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