Question

In colour blindness red, green and other colours appear as
(a)White
(b)Yellow
(c)Grey
(d)Pink

Answer 1

Red/Green or Blue colour blindness is passed down from parents, they may just be able to see shades of black. The gene responsible is on the X chromosome. Colour Blindness is a defect in vision that makes it difficult for a person to distinguish between or among colours.

Complete answer:
Red-green colour blindness is usually inherited from parents. It is passed from mother to son on 23rd chromosome which is a sex chromosome. The symptoms vary from person to person, some people may be able to see every colour but not distinguish red or green. Others may not be able to see blue or yellow. Lastly, some people may not be able to see the colour at all. They may just be able to see shades of black, white and grey. This, however, is very rare. If a person is colour blind it means instructions for cone development are wrong. It may be missing or less sensitive or the pathway from cone to the brain is not developed properly.

Additional Information: -The human eye consists of three kinds of cone cells, each containing a different photopigment which is maximally sensitive to one of the three primary colours ( red, green and blue).
-The sensation of any given colour is determined by the relative frequency of the impulse from each of the three cones present.
-Three different photosensitive pigments: red sensitive cone pigment (erythrosine or LWS), green sensitive cone pigment (Chlorolabe or MWS), and blue sensitive cone pigment (cyanolabe or SWS).
-Individuals with normal colour vision are called trichromats.
-In colour blindness, a mechanism to appreciate one or more primary colours is either defective(anomalous) or absent (anopia). Broadly classified into two types: congenital colour blindness and acquired colour blindness.
-To cure the colour blindness requires some form of gene therapy, repairing the damaged chromosome.
-For colour blindness peoples, light filtering lenses made it possible to provide a greater ability to distinguish between certain shades that otherwise look the same.

So, the correct answer is ‘Grey.’

Note: -More males have affected the females are basically carriers. There is a 50% chance of a mother passing this condition to her son one.
-For a male to be colour blind his X chromosome should have the faulty gene.
-The female might have both X chromosomes normal or one X chromosome might have the faulty gene but the gene on other chromosomes compensates for it so the female is a carrier and passes on the faulty gene to her son so he is colourblind.
-The daughter might be carrier or colour blind if her father is colourblind and the mother is the carrier.