Which statement by a pregnant patient would indicate that additional teaching was necessary?
1. "Because of their birth relationship, fraternal twins are more similar to each other than if they had been born singly."
2. "Identical twins can be the same or different sex."
3. "Congenital abnormalities are more prevalent in identical twins."
4. "Identical twins occur more frequently than fraternal twins."
Correct Answer: 3
Rationale 1: Fraternal twins are not more similar to each other than if they had been born singly.
Rationale 2: Identical or monozygotic twins have identical chromosomal structures and therefore are always the same sex.
Rationale 3: Due to variations in the timing of the splitting of the embryo, congenital abnormalities such as conjoining are more common in monozygotic twins.
Rationale 4: Dizygotic, or fraternal, twins occur more frequently than do monozygotic twins.
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