If so, your baby will have Rh-positive blood. Or you might be what's called heterozygous, meaning you carry one negative and one positive gene. In that case, your baby has a 50/50 chance of having ...

Was blood a factor in the demise of the Neanderthals? New research is showing that Homo sapiens underwent huge changes in ...

Another important antigen is the Rh factor, which gives the "positive" and "negative" signs to blood types ... Mazières and ...