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2.Human Reproduction
normal
The second maturation division of the mammalian ovum occurs
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
Solution
In mammalian ovum during maturation phase, meiosis occurs. Nucleus shift towards animal pole and undergoes meiosis-$I$. After fertilization (penetration of sperm), the second meiotic division is completes 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.
Standard 12
Biology
