NEET 2006 Biology question

If a colourblind woman marries a normal visioned man, their sons will be -

(1)All normal visioned
(2)One-half colourblind and one-half normal
(3)Three-fourths colourblind and one-fourth normal
(4)All colourblindCorrect

Answer: (4)

Solution

Colour blindness is X-linked recessive. A colourblind woman is and a normal man is X Y. Each son receives the Y from the father and an from the mother, so all sons are

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Question ID VK-089709