Question
Biology Question on Principles of Inheritance and Variation
A colour blind girl is rare because she will be born only when
A
her mother and maternal grand father were colour blind
B
her father and maternal grand father were colour blind
C
her mother is colour blind and father has normal vision
D
parents have normal vision but grand parents were colour blind.
Answer
her father and maternal grand father were colour blind
Explanation
Solution
A colour blind girl is rare because she will be I born only when her father and maternal grand father j were colour blind. The genotype of the mother was to be either XCXC or XCX and that of father XCY so that the daughter becomes colour blind.