A pregnant patient asks you to describe the differences between monozygotic and dizygotic twins. Which statement should you include in your teaching?
1. Dizygotic twinning occurs less frequently than does monozygotic twinning.
2. Monozygotic twins originate from division of the fertilized ovum at different stages.
3. Dizygotic twins share one placenta and one chorion.
4. Monozygotic twins are also referred to as "fraternal" twins.
Correct Answer: 2
Rationale 1: Dizygotic twinning occurs more frequently than does monozygotic twinning.
Rationale 2: Monozygotic twins originate from division of the fertilized ovum at different stages of early development.
Rationale 3: Dizygotic twins each have a separate chorion and amnion.
Rationale 4: Monozygotic twins are also referred to as "identical" twins.
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