Chromosomal disorder is associated with chromosomes. Chromosomes are distinct structures which make up protein and DNA. Chromosomes which are mainly the carriers of heritable materials like chromosome structures abnormalities as missing leads to disease. The major abnormalities of chromosomal can be detected using microscopic examination. Trisomy 21 or Down syndrome is a common disorder which occurs when one has copies of chromosome 21. Mitochondrial disorder caused by mutation in nonchromosomal mitochondria DNA. Many genes are named after the disorder they are associated with. The normal functioning of gene is encoded with protein and this is not associated with cause of illness. Diseases linked with genetics occur when genes are not in a position to work properly. The hemochromatosis gene really codes for membrane protein after mutation of the gene in a manner which prevents if from encoding a functional and normal protein products (Milunsky, 67).