GENOME CAN BE DEFINED AS A GENETIC CONTENT OF A CELL. GENOMICS EXPLORES THE SEQUENCING OF GENOMES IN SPECIFIC ORGANISMS. ONE OF TYPE OF GENOMICS IS COMPARATIVE GENOMICS WHICH CAN BE REGARDED AS A VALUABLE TOOL TO DEVELOPMENT MOLECULAR RESOURCES FOR CROPS AND IDENTIFICATION OF MAJOR GENES IN PLANTS. ADDITIONALLY, COMPARATIVE GENETIC IS A NECESSARY TOOL FOR THE STUDY OF THE GENETIC EVOLUTION OF SPECIES. THE PRESENT STUDY HAS MADE AN ATTEMPT TO USE APX1 MARKER AND IDENTIFY CONSERVED REGIONS AMONG A FEW LOCUS, IN COMMON BEAN, CHICKPEA AND PEA USING STS MARKERS. THE AMPLIFIED FRAGMENTS WERE SEPARATED BY ELECTHROPHORESIS, AND THEN THE ISOLATED FRAGMENTS OF EACH SAMPLE WERE SEQUENCED. LATER, NCBI DATABASE AND DNASTAR SOFTWARE WERE USED TO INVESTIGATE THE CONSERVED REGIONS, AND TO PROVIDE VALUABLE INFORMATION ON THE GENOMES OF THE CROPS. CONSEQUENTLY, DESPITE HAVING CONSERVED REGIONS, THE OBTAINED FRAGMENTS REVEALED DIFFERENCES IN THEIR SEQUENCES. THIS CAN BE AS THE RESULT OF THE MUTATION IN THE PROCESS OF THE EVOLUTION. THE EFFECT OF SUCH THE DIFFERENCE ON THE FUNCTION OF SPECIFIC GENES CAN BE STUDIED IN FURTHER RESEARCHES.