partial trisomy 9p Chromosome 9

A chromosomal abnormality characterized by an extra copy of a portion of the short (P) arm of chromosome 9, which may arise from a chromosomal translocation in one of the parents. The severity of the symptoms depends on the size and location of the duplicated region and the genes involved. Affected individuals may have intellectual disability, developmental delay, behavioral problems, and craniofacial abnormalities.

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