The nurse is caring for a patient pregnant with twins. Which statement indicates that the patient needs additional information?
1. "Because both of my twins are boys, I know that they are identical."
2. "If my twins came from one fertilized egg that split, they are identical."
3. "If I have one boy and one girl, I will know they came from two eggs."
4. "It is rare for both twins to be within the same amniotic sac."
1
Rationale 1: Not all same-sex twins are identical or monozygotic, because fraternal, or dizygotic, twins can be the same gender or different genders.
Rationale 2: When the zygote splits, identical twins share the same genotype result.
Rationale 3: The only way to have twins of different genders is if they come from two separate fertilized ova.
Rationale 4: Monoamniotic–monochorionic twins are very rare, and occur as a result of the zygote splitting 7 or more days after fertilization.
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