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  • Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following is correct?

Q.132) Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following is correct?

A)  They have 75% identical genetic content.

B) They are identical twins.

C) They are fraternal (non-identical) twins.

D) They were conceived through in vitro fertilization.

Answers (1)

best_answer

Identical (monozygotic) twins arise from a single fertilized egg that splits, and always have the same sex and identical genetic makeup. In contrast, fraternal (dizygotic) twins result from the fertilization of two separate eggs by two different sperms. They may be of the same or different sexes and share about 50% of their genes, like regular siblings.

Since the twins are a boy and a girl, they cannot be identical. Thus, they must be fraternal twins.

Hence, the correct answer is option (3): They are fraternal (non-identical) twins.

 

Posted by

Saniya Khatri

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