Cosmid

A cosmid is a type of hybrid plasmid used in molecular biology for cloning purposes. It is derived from a combination of a plasmid and a phage (bacteriophage) and is utilized to clone large fragments of DNA, typically ranging from 35 to 45 kilobases (kb). Here are some key features of cosmids: 1. **Origin**: Cosmids are constructed by combining features of plasmids and lambda phage DNA.