2.2 Genes can be mapped by restriction cleavage bp is an abbreviation for base pairs, distance along DNA IS measured in bi Restriction enzymes recognize specific short sequences of DNA and cleave the duplex (sometimes at target site, sometimes elsewhere depending on type) Restriction map is a linear array of sites on DNA cleaved by various restriction enzymes 消当bp is an abbreviation for base pairs; distance along DNA is measured in bp. Restriction enzymes recognize specific short sequences of DNA and cleave the duplex (sometimes at target site, sometimes elsewhere, depending on type). Restriction map is a linear array of sites on DNA cleaved by various restriction enzymes. 2.2 Genes can be mapped by restriction cleavage