If a colour blind man marries a carrier woman for colour blindness, chances of their children to become colour blind is
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Read the question carefully:
- "Chance of {sons} being colorblind" = 50% (1 out of 2 sons).
- "Chance of {children} being colorblind" = 50% (2 out of 4 children).
In this cross, both values happen to be the same, but they can differ.