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Question
A woman with normal vision marries a man with normal vision. They have a colourblind son. Her husband dies and she marries a colourblind man. Show the type of children that might be expected from this marriage and the proportion of each.
Solution
In the first marriage of woman the son was colourblind therefore the woman is a carrier genotype of that Woman: XX
Since the man in the second marriage was colourblind.
The genotype of that man: XY
A possible combination of this marriage.
Expected result:
| Sons: | 50% | Normla: | 25% |
| Colourblind: | 25% | ||
| Daughter: | 50% | (carrier) normal: | 25% |
| Colourblind: | 25% |
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