Ancient intelligent species predating man
Ancient intelligent species predating man - Dirty bi men chat
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 A ve means a blood group which has A antigen and Rh D antigen.
Tests are done during early stages of pregnancy, and if the mother is Rh -ve and the child is Rh ve, then an injection which prevents the mother’s immune system from generating antibodies against Rh D antigen is given during pregnancy.
This will ensure that the fetus remains unaffected by the fact that the mother’s blood is Rh negative and ensures a safe delivery of the child.
Some recent studies have indicated that Rh negative people are resistant to some parasites like Toxoplasma, or to their effects on the body.
So it might as well have served an advantage in this geography NOT to have the Rh D antigen, rather than have it. And one can find many such instances across human evolution.
Around 7,000 publicly-funded schools – one in three – now has a religious affiliation.
As the coalition government paves the way for more faith-based education by promoting ‘free schools’, the renowned atheist and evolutionary biologist Professor Richard Dawkins says enough is enough.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).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.For example humans who come from an ancestry which started domesticating cattle, and consuming dairy products have digestive systems which generate an enzyme called lactase which helps in digesting milk by digesting the sugar lactose in the milk.