A chromosomal abnormality consisting of the presence of one chromosome in addition to the normal diploid number.
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Klinefelter syndrome
MONDO:0006823
mosaic trisomy 3
MONDO:0015060
mosaic trisomy 1
MONDO:0015706
mosaic trisomy 12
MONDO:0015718
mosaic trisomy 14
MONDO:0015725
mosaic trisomy 15
MONDO:0015727