A selectable marker is used to: A Help in eliminating the non-transformants, so that the transformants can be regenerated B Identify the gene for a desired trait in an alien organism C Select a suitable vector for transformation in a specific crop D Mark a gene on a chromosome for isolation using restriction enzyme
Option A. A marker gene is a gene used to determine if a nucleic acid sequence has been successfully inserted into an organism's DNA. The genes that provide resistance to various antibiotics are used as selective markers in cloning vectors. Only those cells which have been transformed successfully can be traced by a selective marker. So, this helps in eliminating non-transformants and permitting transformants.
