Pamela is a young mother whose parents are bot
问题详情
Pamela is a young mother whose parents are both deceased. Assuming that disease X is a genetic disorder with either a dominant or a recessive inheritance pattern, which of the following statements is accurate?
A.If neither of Pamela’s parents ever had disease X, then Pamela does not and never will have disease X.
B.If neither Pamela nor the father of Pamela’s child has disease X, then that child will never have disease X.
C.If both of Pamela’s parents had at least one copy of the disease X gene,then Pamela also has at least one copy of the disease X gene.
D.If neither of Pamela’s parents ever had disease X, but Pamela has disease X,then disease X is not a dominantly inherited genetic disorder.请帮忙给出正确答案和分析,谢谢!
参考答案
正确答案:D
In the case of a disease with a dominant inheritance pattern, if a person has at least one disease gene, that person will definitely have the disease. Since neither of Pamela’s parents had disease X, the disease must have a recessive (and not a dominant) inheritance pattern.