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Human Reproduction question

2025 · Q78
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Human Reproduction question

2025 · Q78

NEETBiologyHuman ReproductionMCQ+4 / −1

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 were conceived through in vitro fertilization.
  2. B
    They have 75%75 \%75% identical genetic content.
  3. C
    They are monozygotic twins.
  4. D
    They are fraternal twins.
View written solutionFree

Correct answer: D

Twins who are a boy and a girl are most likely fraternal twins, also known as dizygotic twins. These twins originate from two separate fertilized eggs, and they typically develop their own amniotic sacs, placentas, and supporting structures. Unlike identical (monozygotic) twins who arise from the same fertilized egg and share identical genetic material, fraternal twins have unique genetic make-ups, similar to regular siblings. Therefore, it's more accurate to categorize boy-girl twins as fraternal.

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