Hi friends in this article let us discuss about a problem…. Well, to be practical I guess this is not a problem, because no one is responsible for this as this occurs mainly due to heredity and lot of science involves in it. I guess some would have guessed the topic, and this is none other than “COLOUR BLINDNESS”.

But before entering into the topic let me say color blind are differentiated into two types

i)People who are completely color blind and this condition is called as achromatopsia or monochromatism

ii)Partical colour blindness where people find difficult to differentiate red and green color and this condition is called as dichromatism

Now in this article let us consider the latter criteria of partial color blindness

Partial color blindness

First and foremost is that there is nothing to panic, if one is color blind, because experts say that is not curable and at the same time this is not a dangerous problem. But some time people who are color blind are affected because they might not have cleared the criteria, in case of any job, i.e. some company recruits only those people who are not color blind and this might hurt those who are color blind.

Well, let’s not get into the statistical data or those stuff with respect to percentage of people who are affected by color blindness. As a matter of fact the majority people who are affected by color blindness are male and let us discuss how it occurs.

i)First of all we must understand that this is an hereditary disease and we can’t blame any individual for this

ii) To start with let me just say the basics. Do you know how we are able to differentiate the red fr0m green color? It is possible only with the help of a “Color sensitive cell “called as “CONES”, which helps us in differentiating the red from green color. These CONES are formed by a gene called as “C”, present in the X chromosomes. So let us have in mind that “CONES” are necessary for a person to differentiate red from green color and the absence of it will results in color blindness

iii) Another important thing form biological point of view is that, Female has a like pair of Sex chromosomes and it is “XX”, whereas male contain the unlikely pair of chromosomes “XY”. Logically thinking we can find from this it is evident that female has a X chromosome higher than that of male, and so males are lacking an X chromosomes, which is necessary for the generation of gene C and results in CONE. But let us discuss it in detail in the following points.

iv) Color blindness occurs mostly when the “X” chromosomes alter the “C” gene in to the recessive ‘c’ gene during the mutation process, which ultimately results in color blind.

v) So women just act as the carrier of the disease and males are affected by this as women reproduce them to their child.

vi) Now let us consider a practical example, when a normal woman (XX) marries a color blind man (XY){remember the x contains the recessive c gene here}, then their son and daughter will be normal and more importantly their daughter will carry the disease. Here in this process

#) SON: Will get X chromosomes (dominant C gene) form mother, Y chromosomes from father

#)Daughter: Will get X chromosomes form mother(dominant C gene) and X from father (recessive c gene).Here as she has a dominant C gene, she will not be color blind, rather she carries the disease. Now if she(XX) { contains dominant and recessive gene) marries a normal man (XY) {dominant C gene), then all their daughter are normal, but half of them carries the disease( just considering the possibilities) and among their sons, half of them will be color blind and other will be normal

So let us take the color blindness test now

Here in the image above Normal peroson can see yellow square and also faint brown circle, whereas the color blind individual will see only yellow square

• Written by Raaghavan Krishnamurthy.
• In category General Reference.
• 14 years ago.

Hot Hits: 3112

Like it on Facebook, Tweet it or share this article on other bookmarking websites.