Chromosomal disorder. Down syndrome or trisomy 21 is a condition cause by an extra (usually maternal) chromosome #21. It cause a typical features(large tongue up slanting eyes sandal toe) as well as mental retardation. Other medical conditions such as leukemias and orthopedic conditions are also more common. Increased incidence is seen with older mothers.
Survivable Chms dfct. Down syndrome applies to kids with a critical extra piece or whole extra 21 chromasome in their cells.The extra piece creates confusion in the information translated into building & maintaining baby, resulting in a variety of abnormalities in development, organs, body structure & metabolism.When issues are addressed these kids can live out a 60+year projected survival. This compairs to < 1yr in some.