The genetic history of the British Isles is the subject of research within the larger field of human population genetics. It has developed in parallel with DNA testing technologies capable of identifying genetic similarities and differences between populations.he genetic history of the British Isles is the subject of research within the larger field of human population genetics. It has developed in parallel with DNA testing technologies capable of identifying genetic similarities and differences between populations.
Brittle diabetesâalso called labile diabetesâis a rare but serious form of the disease in which there are dramatic and often unpredictable fluctuations in blood sugar levels. Blood sugar naturally rises and falls throughout the day in response to meals, exercise and other factors.
Galactosemia is a rare hereditary disease that can lead to cirrhosis in infants, and early, devastating illness if not diagnosed quickly. This disease is caused by elevated levels of galactose (a sugar in milk) in the blood resulting from a deficiency of the liver enzyme required for its metabolism (breakdown).