diseases caused by chromosomal abnormalities
Examples of chromosomal disorders. Some of the most common chromosomal abnormalities include: 1  Down's syndrome or trisomy 21. 2  Edward's syndrome or trisomy 18.3  Patau syndrome or trisomy 13. 4  Cri du chat syndrome or 5p minus syndrome (partial deletion of short arm of chromosome 5).ome of the most common chromosomal abnormalities include: 1  Down's syndrome or trisomy 21. 2  Edward's syndrome or trisomy 18. 3  Patau syndrome or trisomy 13.