In more than 98% of cases, the red blood cell incompatibility involves the Rhesus or Rh D antigen[Rh-negative Factor] so the disease is known as Rhesus disease or Rh disease. Although the exact percentage varies with race, 15% of the United States population is Rh-negative and 85% is Rh-positive. If a Rh-negative woman conceives a child with a Rh-positive partner, the potential exists for the child to inherit its father’s Rh-positive blood type.[ There are two types of Rh-positive men. In 55% of individuals, the man is heterozygous. In this situation, his genetics allow him to produce Rh-negative offspring 50% of the time and Rh-positive offspring the remaining 50% of the time. In the second type of a Rh-positive= individual, homozygous state.]
So… Rh-negative women with a Rh-positive partner are at RISK of spontaneous miscarriage and other fetus REJECTION events. Hmmmm And a Rh-negative woman with a Rh-negative partner has even a smaller chance of having a Baby born alive! Hmmmm… In animals this is seen as a problem, in HYBRID Animals.
Rh-negative women and men have several “Unusual Traits” that Rh-positives don’t.