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Question
The second maturation division of the mammalian ovum occurs
Options:
A .  Shortly after ovulation before the ovum makes entry into the fallopian tube
B .  After the ovum has been penetrated by a sperm
C .  Until the nucleus of the sperm has fused with that of the ovum
D .  In the Graafian follicle following the first maturation division
Answer: Option B
:
B
In mammalian ovum, during maturation phase, meiosis occurs. Nucleus shifts towards animal pole and undergoes meiosis-I. After fertilization the second meiotic division is completed with unequal cytoplasmic cleavage. This forms a large cell called the ootid, with essentially whole of the cytoplasm and a very small cell, the second polar body.

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