Published by:
CGP EDU Academic Team
Published on: August 21, 2026
A man affected by red-green colour blindness marries a woman who is the unaffected daughter of a colour-blind father. Which prediction about their offspring is correct?
Text Solution
Verified by ExpertsThe correct answer is:
A
Parents
• Father (affected): 
• Mother (unaffected but daughter of a colour-blind father): 
(carrier) Cross: 
X (mother) | (mother) | |
(father) | (carrier daughter) | (affected daughter) |
Y (father) | XY (normal son) | (affected son) |
Outcome
• Sons: 
(colour-blind), 
XY (normal) → Exactly half of the sons will be colour-blind.
• Daughters: 
(colour-blind), 
(carrier)
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