And so will uppercase R and lowercase R because uppercase R is dominant over lowercase R. So we have one, two, three out of four will be our RH positive. And so 75% will be RH positive. And there's a 25% chance that it will be RH negative. So we get RH negative only if we have lowercase R, lowercase R. Now, instead of mating a father who is uppercase R, lowercase R and a mother who is uppercase R and lowercase R, let's suppose a woman who is RH negative. So lowercase R, lowercase R decides to have a child with a man with a male who is RH positive. Now, we know there are two different types of RH positives.