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Now there are various useful sugars and proteins on the surface of our red blood cells, which our immune system might otherwise mistake to be foreign bodies and generate antibodies to kill them.However, our immune system is trained to ignore these self antigens (the antigens which are generated inside our body).However, those humans who are only carriers of the gene causing Sickle Cell Anemia, but who don’t have the disease are resistant to Malaria!So in such cases such evolution is useful to the body in areas affected by Malaria even though it may cause problems in those kids where the gene becomes active.

This is also the reason why blood groups like O-ve are very rare.

Most humans have Rh D antigen, and are hence Rh positive. So what caused this mutation where some humans stopped having this antigen in their blood? It is interesting to note that Rh -ve or the absence of Rh D producing genes is common in the European population, even though it is rare in rest of the world.

This suggests that there might be an evolutionary advantage in this European population over NOT having Rh D antigen, than having it.

If these lactose intolerant people drink milk, then they will have symptoms like bloating, sometimes even vomiting.

Does this mean lactose intolerant population are from an alien ancestry?

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