<prompt> The structural abnormality of chromosome in which one arm is lost and remaining arm is duplicated is called:Ring chromosomeIsochromosomeTranslocationMutation  <response>: b. IsochromosomeRef: Nelsons 20e p 590, Ghai 8e p 637Iso-chromosome results when 1 arm of a chromosome is lost and the remaining arm is duplicated or when the axis of division occurs perpendicular to the normal axis of division. 