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.
The OSI Model stands for Open System Interconnection. This model  defines the seven layers of a network which are:    Application (7th Layer)  Presentation (6th Layer)â¦  Session (5th Layer)  Transport (4th Layer)  Network (3rd Layer)  Data Link (2nd Layer)  Physical (1st Layer)  .