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Biology · 2024 · 3 marks
CBSE 2024 · Region 1 · Set 1 · Q26
In a family, the father, the daughter and the son are colour blind, whereas the mother has normal vision. Do you think the son and the daughter have…
In a family, the father, the daughter and the son are colour blind, whereas the mother has normal vision. Do you think the son and the daughter have inherited the disease from their father ? Work out a cross to justify your answer.
Marking-scheme solution
No,
Son inherited disease from the mother and daughter inherited disease from both mother and father.
Mother Father
XCX X XCY
Normal (Carrier) Colour blindXCXC – Colour blind daughter; XCX – Carrier daughter; XCY – Colour blind son; XY – Normal son.
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