<prompt> During surgery for a benign cyst on the kidney, the surgeon notes that the patients right kidney has two ureters and two renal pelvis. This malformation isAn abnormal division of the pronephrosAn abnormal division of the mesonephrosA premature division of the metanephric blastemaA premature division of the ureteric bud  <response>: The ureteric bud seems to be preprogrammed to undergo repeated divisions. These divisions normally begin on contact with the metanephric blastema. If the ureteric bud undergoes division prematurely, duplication of the ureter and renal pelvis occurs. In some circumstances, two separate kidneys may form. 