Chromosomes, which are structural elements containing genes, normally occur in 23 pairs. Down Syndrome, Turner Syndrome. Single Gene Disorders Genetic disorders also can result when an alteration occurs in a gene.
Genes carry the bits of information which determine the development and function of an individual.
Half of our genes are inherited from our mother and half from our father. The disorder shows up in the presence of one abnormal gene. Several generations may be affected or the disorder may occur as a mutation. Occurs with equal frequency in both sexes. Both parents carry one abnormal gene, but are physically and mentally normal.