A) shortly after ovulation before the ovum makes entry into the Fallopian tube
B) until 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
Correct Answer: B
Solution :
In mammalian ovum during maturation phase, meiosis occurs, nucleus shifts towards animal pole and undergoes meiosis-I. After fertilization (penetration of sperm), the second meiotic division is completed with unequal cytoplasmic cleavage. This forms a large cell the ootid with essentially whole of the cytoplasm and a very small cell, the second polar body.
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