Answer:50%
Step-by-step explanation:
Y
Rr Xr Y
Rr Xr Y
Punnet square, colorblind woman would mean recessive traits on both chromosones, and his offspring is a man if the chromosones are XY, therfore we see that he has 100% chance of getting a colorblind son, but only a 2/4 chance of actually having a son. so it is 50%