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Solution


Q.

Meiotic division of the secondary oocyte is completed                     [2020]
1 prior to ovulation  
2 at the time of copulation  
3 after zygote formation  
4 at the time of fusion of a sperm with an ovum  

Ans.

(4)

In humans, the secondary oocyte is produced when the primary oocyte grows in size and completes its first meiotic division. The secondary oocyte will be halted at this stage of metaphase of meiosis II until fertilisation takes place. Thus, when a sperm cell fertilises the female sex cell, the secondary oocyte rapidly completes the remaining stages of meiosis II, giving rise to ovum, with which the sperm cell unites.