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ZoologyNEET 2025Fertilisation, implantation, pregnancy, parturition, lactation

Human Reproduction

Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?

  1. A.They are monozygotic twins.
  2. B.They are fraternal twins.✓
  3. C.They were conceived through in vitro fertilisation.
  4. D.They have 75% identical genetic content.

Solution

Twins of different sexes must have come from two separate zygotes — they are dizygotic (fraternal) twins, genetically no more alike than ordinary siblings.

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