GENETICS & HEREDITY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site trisomy Possessing three copies of a particular chromosome instead of the normal two copies. Down's syndrome is an example of a condition caused by trisomy. Related category    • GENETICS AND HEREDITY Source: National Human Genome Research Institute Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP