It is possible that the main title of the report Trisomy is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
Trisomies are very rare genetic disorders characterized by a chromosome aberration. Chromosomes are found in the nucleus of all body cells. They carry the genetic characteristics of each individual. Pairs of human chromosomes are numbered from 1 through 22, with an unequal 23rd pair of X and Y chromosomes for males, and two X chromosomes for females. People with a Trisomy have an extra chromosome added to one of the normal pairs. Each chromosome has a short arm that is designated "p" and a long arm identified by the letter "q". The triplication of the chromosome may be partial; i.e., with only a portion of the chromosome duplicated. Defects are classified by the name of the abnormal chromosome pair and which portion of the chromosome is affected. For example, 22p+ means that there is an extra short arm added to the 22nd pair of chromosomes. In general, the most common symptom of the trisomies is mental retardation.
Support Organization for Trisomy 18, 13, and Related Disorders
2982 S. Union Street
Rochester, NY 14624-1926
1660 L Street, NW, Suite 301
Washington, DC 20036
National Down Syndrome Congress
1370 Center Drive
Atlanta, GA 30338-
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126