Gene for colour blindness is located on

Q. Gene for colour blindness in man is located on

Q. In humans the gene for red and green colour blindness is located on the sex chromosome. If a male is colour blind and is a child of normal visioned parents, then who among the following in his family is likely to be colour blind?

Q. Genes for colour blindness/sex linked traits are located on

Q. A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?

Q. Red-green colour blindness is a sex-linked inherited characteristic. The gene (allele) b for colour blindness is recessive to the gene B for normal vision. The gene b is carried only on the X chromosome.
(a) Describe these phenotypes.



(b) Explain why red-green colour blindness is more likely to occur in men than in women. [4 MARKS]