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.
ossi-[Latin os, ossis bone] Bone (ossicle). ost-or oste-or osteo-[Greek osteon bone] Bone (ostemia, osteectopia, osteofibroma). ostra-or ostre-or ostrei-or ostreo-[Latin ostrea oyster] Oyster (Ostreidae, ostreophagous).