The parents of a child born with a genetic disorder ask the nurse why the child's heart was affected instead of some other organ. How should the nurse respond?
1. "Not all the DNA code is active in all the cells of the body. The DNA changes were expressed in the cells of your child's heart, but not in other body cells."
2. "We don't know why that happens."
3. "The heart is an essential organ, so it is often affected most dramatically."
4. "Heart cells contain more DNA than other body cells."
1
Rationale 1: All the cells of the body carry the same DNA code, but it is not actively expressed in all cells.
Rationale 2: We do know that not all the DNA code is expressed in all cells.
Rationale 3: The "choice" of which organ system is affected is determined by the DNA code, not by the importance of the organ system.
Rationale 4: The cells of the heart contain the same amount of DNA as other cells.
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