There are three types of genetic disorders: 1  Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example. 2  Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. Chromosomes are the structures that hold our genes. 3  Complex disorders, where there are mutations in two or more genes.
OSI model. The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols.
Obstructive Sleep Apnea (OSA) is a serious, potentially life-altering and life-threatening condition that is easily identified and effectively treated. If you or a loved one suspects you have it, you should be tested as soon as possible. Take personal Sleep Test/Questionnaire. This is a simple test that evaluates you for the most common symptoms of sleep apnea. You can fill it out and take it with you to your next physician visit.