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A normal visioned person has colorblind sister and colorblind brother.His parents must be

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father colorblind, mother carrier but normal visioned

father normal visioned, mother colorblind

both the parents must be normal visioned,but carriers

father normal visioned , mother carrier but normal visioned

answer is A.

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Detailed Solution

Since both brother and sister are affected, both their parents must be carrying the allele.

Offspring - XY (normal son), X^CX^C (colour blind daughter), X^CY (colour blind son)

Parents - XX^C (carrier mother) and X^CY (colour blind father)

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