fragile X chromosome


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frag·ile X chro·mo·some

an X chromosome with a fragile site near the end of the long arm, resulting in the appearance of an almost detached fragment; demonstrated only under special culture conditions; frequently associated with X-linked mental retardation. See: Renpenning syndrome.

frag·ile X chro·mo·some

(fraj'il krō'mŏ-sōm)
An X chromosome with a weak (i.e., fragile) site near the end of the long arm, resulting in the appearance of an almost detached fragment; frequently associated with X-linked mental retardation.
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