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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
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The second maturation division of the mammalian ovum occursa)shortly a...
During oogenesis, primary oocyte grows and completes- meiosis I (first maturation division) producing a large secondary oocyte and a small polar body. The secondary oocyte proceeds with meiosis II (second maturation division) but the division gets arrested at metaphase stage. It is in this stage of oocyte that the ovum is shed during ovulation. It passes into oviduct, where the cell cycle resumes only after the entry of sperm.
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Most Upvoted Answer
The second maturation division of the mammalian ovum occursa)shortly a...
The second maturation division of the mammalian ovum occurs after the ovum has been penetrated by a sperm. This process is known as fertilization and marks the beginning of embryonic development.

Explanation:
- Fertilization: When a sperm penetrates the outer layer of the ovum, it triggers changes in the ovum's membrane, preventing other sperm from entering. The sperm's nucleus then fuses with the ovum's nucleus, forming a zygote.
- Second maturation division: After fertilization, the zygote undergoes the second maturation division, in which the replicated chromosomes separate into two identical sets. This process results in the formation of two cells, each containing a complete set of chromosomes. These cells are known as blastomeres and will continue to divide and differentiate to form the embryo.

Therefore, the correct answer is option B, as the second maturation division occurs after the ovum has been penetrated by a sperm during fertilization.
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The second maturation division of the mammalian ovum occursa)shortly after ovulation before the ovum makes entry into the Fallopian tubeb)until after the ovum has been penetrated by a spermc)until the nucleus of the sperm has fused with that of the ovumd)in the Graafian follicle following the first maturation divisionCorrect answer is option 'B'. Can you explain this answer?
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