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 most likely have?

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Klinefelter syndrome is caused by the presence of an extra X chromosome in males (XXY). This is the most likely diagnosis for a child who has an extra sex chromosome in their cells. Down syndrome, on the other hand, is caused by a full or partial extra copy of chromosome 21, while Turner syndrome is caused by the presence of only one X chromosome in females. Hemophilia is a genetic disorder that affects blood clotting and is not typically associated with chromosomal abnormalities.

Tony and Tina Can Tell at Birth That Something Is