double aneuploidy

Is Klinefelter Syndrome Down Syndrome? In conclusion, Down–Klinefelter’s syndrome is a rare chromosomal abnormality. Patient present with physical characteristics of Down’s syndrome at birth and Klinefelter’s syndrome features at during puberty. Is Klinefelter syndrome caused by trisomy? Klinefelter syndrome is caused by an additional X chromosome. This chromosome carries extra copies of genes, which interfere