Chromosome Abnormalities There are many different types of chromosome abnormalities that require clinical care by a physician or other healthcare professional. Listed in the directory below are some, for which we have provided a brief overview.

If you cannot find the information in which you are interested, please visit the Medical Genetics Related Web sites page to view a list of Web sites that may contain additional information on that topic. Overview of Chromosome Abnormalities Types of Chromosome Abnormalities Numerical Abnormalities: Overview of Trisomies and Monosomies Down Syndrome Trisomy 18 & 13 Turner Syndrome Structural Abnormalities: Deletions (Cri du Chat) and Duplications (Pallister Killian) Translocations Translocation Down Syndrome Other Arrangements: Rings and Inversions Mosaicism Mosaic Down Syndrome How Chromosome Abnormalities Happen: Meiosis, Mitosis, Maternal Age, Environment Chance a Chromosome Abnormality Will Occur Again: Numerical, Structural (Inherited and De Novo), Mosaicism Return to the Genetics Home Page Return to the Disorders, Diseases and Organ Topics Home Page