Twins are born to a family that lives next door. The twins are a boy and a girl. Which of the following must be true?

Options

1. They are monozygotic twins
2. They are fraternal twins
3. They were conceived through in vitro fertilization
4. They have 75% identical genetic content

Correct Answer

They are fraternal twins

Explanation

Monozygotic twins are genetically identical and always same sex. Opposite-sex twins must be dizygotic (fraternal), formed from two different eggs and sperm.

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