Ms.Dawson recently gave birth to twins,a girl and a boy.Which of the following statements about them must be true?

Question

Quizplus · Accepted Answer

Since the twins are a girl and a boy, they cannot be monozygotic (identical) as monozygotic twins come from a single fertilized egg that divides into two embryos, both of which are the same sex. Therefore, the twins must be dizygotic (fraternal) which means they developed from two separate eggs fertilized by two separate sperm. As a result, they share approximately 50% of their genes, just like any other full siblings.

MsDawson Recently Gave Birth to Twins,a Girl and a Boy