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Being Rh-negative means you don't have a certain protein ("D antigen" or the Rh factor) on the surface of your red blood cells. If you do have it, you're Rh-positive. So the terms “Rh-negative” and “Rh-positive” are really just terms that further define what type of blood a person has, beyond the general blood type categories of A, B, AB, and O.
Being Rh-negative is neither good nor bad, but it can become a serious issue if you’re pregnant by or planning to have a child with a man who is Rh-positive.
In the United States, the population of Rh-negative individuals varies among ethnic groups. The highest prevalence is found among Caucasians (15%), followed by African Americans and Hispanics (8% each), and Asians and Native Americans (1% each). For the small percentage of people who are Rh-negative, their blood type causes no special health concerns except when they give or receive blood, or during pregnancy.
Clinically, the Rh factor, like ABO factors, can lead to serious medical complications. The greatest problem with the Rh group is not so much incompatibilities following transfusions (though they can occur) as those between a mother and her developing fetus. Mother-fetus incompatibility occurs when the mother is Rh- (dd) and the father is Rh+ (DD or Dd). Maternal antibodies can cross the placenta and destroy fetal red blood cells. The risk increases with each pregnancy. Europeans are the most likely to have this problem--13% of their newborn babies are at risk. Actually only about ½ of these babies (6% of all European births) have complications. With preventive treatment, this number can be cut down even further. Less than 1% of those treated have trouble. However, Rh blood type incompatibility is still the leading cause of potentially fatal blood related problems of the newborn. In the United States, 1 out of 1000 babies are born with this condition.
Originally posted by NoRegretsEver
reply to post by PurpleDog UK
d the fact that we can come up with a remedy for this and not things that have been here much longer is something to ponder.
Originally posted by VneZonyDostupa
reply to post by Greensage
That's not exactly how evolution works.
For your theory to pan out, you would have to have a random mutation in the population that would cause a woman to have more "teats" (and such a mutation would take millenia, not a few generations), and then you would have to have these women gradually produce more offspring than other woman.