A mother expresses the symptoms for Huntington's disease,an autosomal dominant trait.What are the chances that her offspring would carry a mutated allele if her partner is unaffected by the disease?
A) 0-25%
B) 25-50%
C) 50-100%
D) 75%
E) 100%

Question

A mother expresses the symptoms for Huntington's disease,an autosomal dominant trait.What are the chances that her offspring would carry a mutated allele if her partner is unaffected by the disease?  
A) 0-25%
B) 25-50%
C) 50-100%
D) 75%
E) 100%

Quizplus · Accepted Answer

Huntington's disease is an autosomal dominant disorder, meaning only one copy of the mutated allele is needed for the trait to be expressed. If the mother has the disease, she has one mutated allele and one normal allele. The unaffected father has two normal alleles. Each child has a 50% chance of inheriting the mutated allele from the mother.

A Mother Expresses the Symptoms for Huntington's Disease,an Autosomal Dominant