If you have Homozygous Recessive x Heterozygous Dominant there's a 50-50 chance the offspring will show the recessive trait. You'd have to know whether the person with the dominant trait is hetero or homo
Whoa. Rewinding brain... please hold.... Okay. If I remember correctly (and my terms are right, too), a recessive allele cannot override a dominant one under normal circumstances, but there is something called co-dominance in which two alleles of equal dominance can both manifest. I believe people whose eyes are different colors may be an example of this, but I'm not sure.