KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation
Both husband and wife have normal vision though their fathers were colour blind and mothers did not have any gene for colour blindness. The probability of their daughters becoming colour blind is
- A 0%
- B 25%
- C 50%
- D 75%
Answer & Solution
Correct Answer
(A) 0%
Step-by-step Solution
Detailed explanation
(A) 0%,,br>Given: Both husband and wife have normal vision.
Both fathers were clourblind i.e., \(X ^{ C } Y\)
Both mothers did not carry the gene for colour blindness, i.e., XX.
The wife, being normal, must be a carrier ( \(X ^{ C } X\) ) because her father was colour blind ( \(X ^{ C } Y\) ).
The husband is normal (XY) since he has normal vision and no gene for colour blindness from his mother.
Both fathers were clourblind i.e., \(X ^{ C } Y\)
Both mothers did not carry the gene for colour blindness, i.e., XX.
The wife, being normal, must be a carrier ( \(X ^{ C } X\) ) because her father was colour blind ( \(X ^{ C } Y\) ).
The husband is normal (XY) since he has normal vision and no gene for colour blindness from his mother.
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