A) Mother colourblind with blood group-A and father normal with blood group-B
B) Mother normal with blood group-A and father colourblind with blood group-B
C) Mother colourblind with blood group-B and father normal with blood group-B
D) Mother normal with blood group-A and father colourblind with blood group-B
Correct Answer: B
Solution :
Colour blindness is caused by recessive sex-linked gene carried by X-chromosome. So. male, one recessive gene is sufficient for its expression, ie, \[({{X}^{c}}Y)\]but female needs two recessive genes\[({{X}^{c}}{{X}^{c}})\]for the expression of colour blindness. Mother will colourblind with blood group-A and father normal with blood group-B. So, All the sons will be colourblind with blood group-AB.You need to login to perform this action.
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