<prompt> Renal agenesis is because of all exceptDefective development of nephritis tissueFailure of fusion of ureteric bud with metanephrosFailure of ascent of primitive cellsAll of the above  <response>: Renal agenesis is a condition in which a newborn is missing one or both kidneys. Unilateral renal agenesis URA is the absence of one kidney. Bilateral renal agenesis BRA is the absence of both kidneys. Renal agenesis happens in the womb when one or both kidneys do not develop. It is estimated that one baby in a thousand is born with only one kidney. However, it is very rare that both kidneys do not develop. Development of Kidney: Secretory pa of kidney:derived from metanephronsmetanephric blastyma Collecting pa of kidney:derived from ureteric bud 