Human ReproductionMedium

Question

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

A.They are monozygotic twins.
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.

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