Answer: 1). to visualize prob hybridization events A specific radioactive probes of a sequence of interest reacts with filters that have copies of the cDNA. The probe binds to the sequence of interest and the colony\'s location can be seen via autoradiography. 2. False The chromosome walking was the first method used to construct the clone contigs of the physical maps Solution Answer: 1). to visualize prob hybridization events A specific radioactive probes of a sequence of interest reacts with filters that have copies of the cDNA. The probe binds to the sequence of interest and the colony\'s location can be seen via autoradiography. 2. False The chromosome walking was the first method used to construct the clone contigs of the physical maps.