Regarding Genetic Factors Linked to Intellectual Disabilities, Which of the Following

Multiple Choice

Regarding genetic factors linked to intellectual disabilities, which of the following statements is FALSE?

A) Although Down syndrome is genetic, it is not usually hereditary in the sense that it doesn't "run in the family."
B) Down syndrome children have an extra X chromosome in the 23rd pair.
C) Children with PKU (phenylketonuria) have an inherited inability to control a destructive chemical that builds up in their bodies.
D) Individuals with Down syndrome have almond-shaped eyes, a slightly protruding tongue, a stocky build, and stubby hands with deeply creased palms.