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A colourblind man marries with a daughter of colourblind father, the generation will be:
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Half sons will be colourblind
A colourblind man marries with a daughter of the colourblind father. The generation will be half sons colourblind. Daughter of a colourblind person is a carrier of this disease, i.e., one X-chromosome have recessive genes. Therefore, half of the sons will be colourblind.
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