When a sperm enters an egg of frog

First polar body is formed

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First meiotic division occurs

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Second meiotic division occurs

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Fertilization process is completed

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Solution

The correct option is C Second meiotic division occurs
When a sperm enters the cytoplasm of the oocyte, there is a cortical reaction, which prevents other sperms from fertilising that egg. The oocyte now (after sperm enters the oocyte) undergoes second meiotic division producing haploid ovum and releases a polar body.
So, the correct answer is option C.

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