Many Hereditary Disorders Such as Tay-Sachs or Phenylketonuria Affect Metabolic

Multiple Choice

Many hereditary disorders such as Tay-Sachs or phenylketonuria affect metabolic functioning.What is the prognosis for children with these disorders?

A) All are lethal, so all children will not survive.
B) All are treatable, so all children will live normal lives.
C) Some are lethal and others are treatable through diet, hormones, or gene replacement.
D) Even if treated, all affected children typically have serious abnormalities that prevent normal lives.