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NEET 2010
Exam
NEET
Year
2010
Subject
Zoology
Chapter
Human Reproduction

NEET 2010 · Zoology · Human Reproduction

The second maturation division of the mammalian ovum occurs

The second maturation division of the mammalian ovum occurs

Options

  1. Ashortly after ovulation before the ovum makes entry into the Fallopian tube
  2. Buntil after the ovum has been penetrated by a sperm
  3. Cuntil the nucleus of the sperm has fused with that of the ovum
  4. Din the Graafian follicle following the first maturation division

Correct answer

B. until after the ovum has been penetrated by a sperm

Step-by-step 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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