In pBR³²² which is the selectable marker is

(a) amp^R gene

(b) tet^R gene

(c) rop

In pBR³²² which is the selectable marker is  amp^R gene and tet^R gene. A selectable marker is a gene that is used to select for the presence of a particular vector, plasmid, or gene of interest in a host cell. Selectable markers are often used in molecular biology to identify and isolate cells that have taken up a vector or plasmid of interest during genetic engineering experiments.