<prompt> Yoyo reflex is seen in:Duplication of ureterPolycystic KidneyMelluary sponge kidneyPseudo Kidney  <response>: Ans. a Duplication of ureterRef Internet sources Yo-Yo Reflex is seen in duplicated system of ureter The ectopic ureter joins the normal ureter and may cause obstruction or reflex. This is known as Yo-Yo reflex 