Q176 / 180 · NEET 2025 · Zoology

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?

  • A
    They are monozygotic twins.
  • Correct answer
    B
    They are fraternal twins.
  • C
    They were conceived through in vitro fertilization.
  • D
    They have $75 \%$ identical genetic content.

Solution

Fraternal twins or dizygotic twins are 2 separate fertilized eggs, they usually develop 2 separate amniotic sacs, placentas and supporting structures. If twins are a boy and a girl, this indicates they are fraternal twins.

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

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