A male is born with an extra X chromosome if he has:

A) phenylketonuria.
B) Down syndrome.
C) Turner syndrome.
D) Klinefelter syndrome.

Klinefelter Syndrome

A genetic condition affecting males, characterized by the presence of an extra X chromosome, leading to symptoms like reduced fertility and physical development issues.

Phenylketonuria

A genetic disorder characterized by the body's inability to break down the amino acid phenylalanine, leading to harmful levels in the bloodstream and brain.

Turner Syndrome

A genetic disorder in females characterized by the absence of all or part of one of the two X chromosomes.