MHT CET · BIOLOGY · STD 12 - 3. Inheritance and Variation

A woman has normal vision but some of her sons and daughters are colorblind. What will be the genotype of the woman and her husband?

A
\(X^C X^c\) \(X^C Y\)
B
\(X^C X^c\) \(X^cY\)
C
\(X^c X^c\) \(X^cY\)
D
\(X^C X^C\) \(X^C Y\)

Verified Solution

Answer & Solution

Correct Answer

(B)


\(X^C X^c\)	\(X^cY\)

Step-by-step Solution

Detailed explanation

i. Colour blindness is X-linked recessive disorder.
ii. Son receives X chromosome from his mother and Y chromosome from his father.
iii. As some sons are colourblind Genotype of woman will \(X^c X^c\)
iv. As some daughters are colourblind, genotype of husband will be \(X^c Y\)
v. Pattern of inheritance:

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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