Phenylketonuria, sickle-cell anemia, and cystic fibrosis are all

Question

Quizplus · Accepted Answer

Phenylketonuria, sickle-cell anemia, and cystic fibrosis are all caused by recessive genes on autosomes (non-sex chromosomes). This means that an individual must inherit two copies of the mutated gene, one from each parent, in order to develop the disorder. Autosomal dominant disorders require only one copy of the mutated gene in order to be expressed, while sex-linked disorders are inherited on the X or Y chromosome. Teratogens are environmental factors that can cause birth defects, but they are not the cause of these specific disorders.

Phenylketonuria, Sickle-Cell Anemia, and Cystic Fibrosis Are All