Twins are born to a family that lives next door to you. The twins...

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?

Options

AThey are monozygotic twins.
BThey are fraternal twins.
CThey were conceived through in vitro fertilization.
DThey have $75 \%$ identical genetic content.

Correct answer

B. They are fraternal twins.

Step-by-step 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.

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