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B
Before ovulation, within tertiary follicle
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C
When sperm enters in secondary oocyte during fertilization
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D
After zygote formation
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Solution
The correct option is C When sperm enters in secondary oocyte during fertilization Meiosis-II in secondary oocyte completes with the entry of sperm in the cytoplasm of secondary oocyte to form mature ovum (ootid) and second polar body.