Cloning Vectors
Cosmid vectors are

plasmids that have no selection marker
cryptic plasmids
phages that lack cos site
plasmids that contain fragment of λ DNA including the cos site

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Cloning Vectors
Cosmids lack

genes coding for viral proteins
origin of replication
cleavage site for the insertion of foreign DNA
marker genes coding for replication

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Cloning Vectors
Phagemid consist of

plasmid vector carrying origin of replication of λ phage only
plasmid vector carrying λ attachment (λ att) site
plasmid vector carrying origin of replication of plasmid only
plasmid vector carrying λ phage's cos site

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