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  4. Anish is having colour-blindness and married to Sheela, who is not colour-blind. What is the chance that their son will have the disease ?

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Q. Anish is having colour-blindness and married to Sheela, who is not colour-blind. What is the chance that their son will have the disease ?

WBJEEWBJEE 2014Principles of Inheritance and Variation

Solution:

If Sheela (mother) is a carrier then chances of having colour blind son are 50%. If Sheela is normal then chances of their son being colour blind are 0%. It can be represented as follows.
Case I :
image
Thus, there are 50% chances of their son being colourblind.
Case I I :
image
Thus, there are 0% chances of their son being colourblind.