Question

Write about hereditary colour blindness

Answer 1

Colour blindness is a usually a genetic (hereditary) condition (you are born with it). Red/green and blue colour blindness is usually passed down from your parents. The gene which is responsible for the condition is carried on the X chromosome and this is the reason why many more men are affected than women.

Answer 2

Hi mate

here's your answer

Different kinds of colour-blindness have been detected but in the most common.Again this is due to the presence of a defective gene or absence of the gene,responsible for colour vision.The genes for both haemophilia and colour-blindness are located on X-chromosome,

and hence, the disorder is passed down from mother to the son because a boy receives the X chromosome from the mother and Y chromosome from the father.

In the mother, with two X-chromosomes, the defect does not show up. Also in the

daughter, the effect of defective gene on X-chromosome inherited from mother

may be masked by a normal gene on the X-chromosome, inherited from her father.

Since X chromosome bears the defective gene, the son suffers from the genetic disorder, as male has only one X chromosome and one Y chromosome and so the defective gene does not get masked.

hope this helps you

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