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OpenStudy (anonymous):

A boy with an extra X chromosome probably has which of the following syndromes? Down syndrome Klinefelter syndrome XXX syndrome

OpenStudy (anonymous):

please help me

OpenStudy (anonymous):

Considering the fact that X chromosomes come in 1 with Y (XY) and it is occurring to a MALE The best answer is Klinefelter Syndrome. Reason being Klinefelter is where the male has an extra copy of an X Chromosome giving the individual (XXY).

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