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An Intiative by Sri Chaitanya
a
simultaneously with first cleavage
b
after entry of sperm but before fertilisation
c
after fertilisation
d
before entry of sperm into ovum.
answer is B.
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Detailed Solution
At the time of ovulation, the secondary oocyte is in metaphase of Meiosis II. Meiosis II is completed after the entry of the sperm. This results in the formation of second polar body and ovum. Then male pro nucleus and female pro nucleus fuse to form synkaryon (amphimixis).