Which statement most accurately describes dominant genetic disorders?
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

Dominant genetic disorders are characterized by the fact that only one copy of the mutant gene is needed for the individual to be affected. This means that if a parent has a dominant genetic disorder, each child has a 50% chance of inheriting the disorder, regardless of how many children the family has. This risk does not increase or decrease with the number of affected children already in the family, making option D the most accurate description.

Which Statement Most Accurately Describes Dominant Genetic Disorders