Genetic services for people with intellectual disability and their families.

This paper reviews the advances in molecular genetics over the recent years and discusses the impact it may have on those with intellectual disability and their families. The aim is not to present a comprehensive scientific treatise but rather to use illustrations from genetics to highlight our current thinking and draw attention to areas of uncertainty and misinformation. As our knowledge and understanding of the genetic basis of disease increases over the years, there may be significant benefits to some families, but the potential for discrimination against individuals on genetic grounds will also increase.