True about colour blindness: September 2005
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.
Autosomal dominant inheritance
Tritanopia is the commonest disorder
Trichromats are unable to appreciate blue colour
Defect in 1 or more prime colours