What is the origin of replication in chromosome? State its function.

An origin of replication is a sequence of DNA at which replication is initiated on a chromosome, plasmid, or virus. For small DNAs, including bacterial plasmids and small viruses, a single origin is sufficient.

Larger DNAs have many origins, and DNA replication is initiated at all of them; otherwise, if all replication had to proceed from a single origin, it would take too long to replicate the entire DNA mass.