A woman pregnant with twins asks the nurse about differences between identical and fraternal twins. The nurse explains that since it has been determined that she is having a boy and a girl, they are fraternal, and there will be:
1. One placenta, two amnions, and two chorions.
2. Two placentas, two amnions, and two chorions.
3. Two placentas, one amnion, and two chorions.
4. Two placentas, two amnions, one chorion.
2
Rationale 1: Fraternal twins do not have one placenta, two amnions, and two chorions.
Rationale 2: This is the correct answer. Fraternal twins have two placentas, two amnions, and two chorions. There are always two placentas, but sometimes they will fuse together.
Rationale 3: Fraternal twins do not have two placentas, one amnion, and two chorions.
Rationale 4: Fraternal twins do not have two placentas, two amnions, and one chorion.
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