Huntington's disease is a dominant autosomal genetic disorder.Albert has Huntington's disease as did his mother.His father was normal.Albert is married to Lydia who does not have Huntington's disease.If Albert and Lydia have a child,what is the probability that their child will have Huntington's disease?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Question

Quizplus · Accepted Answer

Since Huntington's disease is a dominant autosomal genetic disorder and Albert has the disease, he must have inherited one copy of the mutated gene from his affected mother. This means that he could pass on the disease-causing gene to his offspring with a probability of 50%. Since Lydia does not have Huntington's disease, she definitely does not have the disease-causing gene to pass on. Therefore, the probability of their child inheriting the gene from Albert is 50%.

Huntington's Disease Is a Dominant Autosomal Genetic Disorder