Q15 of 48 Page 21

Which type of cell division forms spermatids from the secondary spermatocytes?

In the first meiotic (meiosis I) division, the primary spermatocyte divides into two secondary spermatocytes. Each secondary spermatocyte formed, then divides into spermatids through second meiotic division (meiosis II)


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How does zona pellucida of ovum help in preventing polyspermy?

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Mention the importance of LH surge during menstrual cycle.

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A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.

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a. How many spermatozoa are formed from one secondary spermatocyte?

b. Where does the first cleavage division of zygote take place?