With regard to the estimation and interpretation of the recurrence of risks for genetic disorders,what should nurses be aware of?
A) With a dominant disorder,the likelihood of the second child also having the condition is 100%.
B) An autosomal recessive disease carries a one in eight risk of the second child also having the disorder.
C) Disorders involving maternal ingestion of drugs carry a one in four chance of being repeated in the second child.
D) The risk factor remains the same no matter how many affected children are already in the family.

Question

Quizplus · Accepted Answer

Each pregnancy is an independent event.The risk factor (e.g. ,one in two,one in four)remains the same for each child,no matter how many children are born to the family.In a dominant disorder the likelihood of recurrence in subsequent children is 50% (one in two).An autosomal recessive disease carries a one in four chance of recurrence.Subsequent children would be at risk only if the mother continued to take drugs;the rate of risk would be difficult to calculate.

With Regard to the Estimation and Interpretation of the Recurrence