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

A) They share 100 per cent of their genes.
B) They are monozygotic.
C) They are dizygotic.
D) They originated from a single zygote.

Question

Gerald Paul-Ebiai · Accepted Answer

Final Answer : C, Explanation :  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.

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

A) They share 100 per cent of their genes.
B) They are monozygotic.
C) They are dizygotic.
D) They originated from a single zygote.

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Learning Objectives

Related questions

Ms.Dawson recently gave birth to twins,a girl and a boy.Which of the following statements about them must be true?A) They share 100 per cent of their genes.B) They are monozygotic.C) They are dizygotic.D) They originated from a single zygote.

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Learning Objectives

Learning Objectives

Related questions

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

A) They share 100 per cent of their genes.
B) They are monozygotic.
C) They are dizygotic.
D) They originated from a single zygote.