A study by scientists from the University of Leeds University in London that marriage of relatives increases the risk of birth of children with congenital defects,
Galactosaemia
Is a rare genetic metabolic disorder that affects the child's ability to metabolize galactose sugar correctly. Therefore, the most likely cause of Galactosaemia is the marriage of relatives because this factor leads to a deficiency of the enzyme responsible for the breakdown of sufficient galactose.
The only treatment for Galactosaemia is to eliminate lactose and galactose from the diet. Despite early diagnosis and limited diet, some individuals with the disease suffer from long-term complications such as speech difficulties, learning difficulties, neurological disorders and ovarian failure.
Sickle cell anemia
It is an inherited form of anemia and is transmitted to children because of the marriage of relatives. This condition is a significant lack of healthy red blood cells, which prevents the carrying of sufficient oxygen throughout the body.
Normally, red blood cells are flexible and round, and move easily through blood vessels. In sickle cell anemia, red blood cells become rigid and sticky and take the form of crescent. There is no cure for most people with sickle cell anemia, but there are some ways that pain can be relieved.
Wilson's disease
Wilson's disease, also known as gastric hepatic degeneration and progressive lengthening degeneration, is a rare genetic disorder that is transmitted to the child because of the marriage of relatives. This type of disease causes copper poisoning in the body.
In the healthy body, the liver excretes excess copper and releases it through the urine, but when Wilson's disease occurs, the liver can not remove the additional copper properly. Additional copper accumulates in organs such as the brain, liver and eyes.