Fundamentholfundamenthol
NEET2025Biology
Q.

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 have 75% identical genetic content.

  2. B

    They are monozygotic twins.

  3. C

    They are fraternal twins.

  4. D

    They were conceived through in vitro fertilization.

Solution

Monozygotic (identical) twins arise from a single fertilised egg and therefore share the same genetic sex. If one twin is a boy and the other a girl, they must have come from two separately fertilised eggs — i.e. they are fraternal (dizygotic) twins.

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