True about colour blindness: September 2005
Autosomal dominant inheritance
Tritanopia is the commonest disorder
Trichromats are unable to appreciate blue colour
Defect in 1 or more prime colours
Ans. D: Defect in 1 or more prime colours Colour blindness is inherited as recessive and X-linked characteristics. The prefixes "Prot-" "Deuter-"and "Trit-" stands for defects of Red, Green and Blue cone systems. So tritanopia (Rarest) has Defect of blue colour. Trichromats are normal individuals.