Q168 / 200 · NEET 2010 (Screening) · Zoology

The second maturation division of the mammalian ovum occurs

  • A
    shortly after ovulation before the ovum makes entry into the Fallopian tube
  • Correct answer
    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 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.

Hence, the correct answer is option: 'B'.

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