A baby is born with a genetic disorder, and neither parent has a history of this disorder. What should the nurse use to explain the baby's genetic disorder?
1. de novo
2. penetrance
3. an X-linked dominant condition
4. multifactorial conditions
Correct Answer: 1
When there is no previous history of a condition, including even subtle signs and symptoms of the disease in any other immediate or distant family member, the disease may be caused by a spontaneous new mutation. This is called de novo. Penetrance is the probability that a gene will be expressed phenotypically. X-linked conditions are recessive in nature. Multifactorial conditions occur as a result of genetic variations and lifestyle and environmental influences that work together.
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