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Q.

How many secondary spermatocytes are required to form 400 million spermatozoa?

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a

50 million 

b

100 million 

c

200 million 

d

400 million 

answer is C.

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Detailed Solution

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Secondary spermatocytes are formed after the meiosis I of primary spermatocytes. During the meiosis II, each secondary spermatocyte divides into two spermatids. Each spermatid then undergoes further changes to mature into a single spermatozoon (spermiogenesis). 

Number of secondary spermatocytes = Number of spermatozoa / Number of spermatids per secondary spermatocyte
= 400 million / 2
= 200 million

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