Klinefelter's syndrome is a condition caused by a chromosome nondisjunction in males; affected individuals have a pair of X sex chromosomes instead of just one. It causes the male to be infertile. Patau syndrome, also known as Trisomy 13, is a chromosomal aberration, a disease in which a patient has an additional chromosome 13.Patau syndrome is associated with severe mental retardation, small eyes that may exhibit a split in the iris, a cleft lip and/or …showed first 75 words of 619 total…

…showed last 75 words of 619 total…by the absence or underdevelopment of the 6th and 7th cranial nerves. These nerves control eye movements and facial expression. Werner Syndrome is a premature aging disease that begins in adolescence or early adulthood and results in the appearance of old age by 30-40 years of age. Its physical characteristics may include short stature and other features usually developing during adulthood: wrinkled skin, baldness, cataracts, muscular atrophy and a tendency to diabetes mellitus, among others.