<prompt> of offsprings affected by colour blindness, of a healthy male and heterozygous female:None2550100  <response>: b. 25Ref: Nelsons 20e p 642; Ghai 8e p 641Color blindness is an X-linked recessive disorder.In X-linked disorders, if father is normal and mother is a carrier, 50 of children will inherit defective X chromosome.Out of these, the daughters having 1 normal and 1 defective X chromosome will act as carriersWhile, all sons, inheriting the defective X chromosome will be affected by colour blindness. Hence, 25 of children will be affected. 