Cystic Fibrosis is a disease common among people with European ancestry. People with the disease do not usually survive into their twenties. Cystic Fibrosis is autosomal recessive. Symptoms related to the disease are difficulty breathing, mucous production in the respiratory and digestive systems, and several infections. Tay-Sach's disease destroys the nervous system. It is common among Jewish Europeans. The inheritance pattern for Tay-Sachs is autosomal recessive. Most people with this disease die at a very …showed first 75 words of 639 total…

…showed last 75 words of 639 total…not develop and they become sterile. Down Syndrome, also called Trisomy 21, occurs when there is a copy of chromosome 21. It is autosomal nondisjunction. In the United States 1 baby in every 800 is born with Down syndrome. It results in mental retardation ranging from mild to severe. People with Down syndrome have an increased susceptibility to many diseases. In rare cases there are the normal 46 chromosomes but a small portion of chromosome 21 is attached to another chromosome.