Question

A man whose father is a colourblind, marry a woman, who is a daughter of colourblind mother. The offspring of this couple will be

• A. all daughter and sons are colourblind
• B. 50% colourblind and 50% normal son
• C. carrier normal daughter and colourblind sons
• D. colourblind sons and normal daughter

Answer 1

Answer: (C)

carrier normal daughter and colourblind sons

Answer 2

Man is normal while women of colourblind mother is also colourblind. The gene for colour blindness is present on $X$-chromosome as a recessive autosomal diseases. One $X$-chromosome from mother goes to daughter and other to son while the X-chromosome of father (Normal) goes to daughter and $4$ chromosome to son.