So the gene that does not code for it. So to see what we mean by that, let's suppose we have a father that is heterozygous for that trait. So we have a dominant uppercase R and a recessive lowercase R. And let's suppose the father mates with a mother, a female that is also heterozygous for that same trait. So uppercase R, lowercase R, so we have the father and the mother and they have an offspring, a child. Now, what this describes is the probability of the child being RH positive or RH negative. So because the gene is dominant to the recessive trait that means upper case R and uppercase R will be RH positive.