In a consanguineous marriage, it is likely that the same gene was acquired from the couple and their common ancestor and passed on to their children. If the gene is inherited in an autosomal recessive manner, their children are likely to be mutant purets and develop the disease. Therefore consanguineous marriages increase the risk of certain autosomal recessive diseases. Consanguineous marriages increase the probability of getting such a pure or identical pair of genes in the children. For example, some hereditary albinism, hemophilia, and congenital mental retardation are possible.