Tony and Tina can tell at birth that something is wrong with their son. Genetic tests indicate that the child has an extra chromosome in his cells and that chromosome is a sex chromosome. Which of the following does the child have?

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Klinefelter syndrome is characterized by an extra X chromosome in males, resulting in XXY instead of XY. This is a type of sex chromosome aneuploidy, which is indicated in the question as an extra sex chromosome. Down syndrome is caused by an extra copy of chromosome 21, hemophilia is a genetic disorder related to blood clotting factors, and Turner syndrome is caused by a missing or incomplete X chromosome in females.

Tony and Tina Can Tell at Birth That Something Is