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.

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21, not an extra X chromosome. This condition is also known as trisomy 21.

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