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Why do people have different blood types? - Scientific American


Karl Landsteiner described the original blood types--A, B and O--in 1900 and doctors now recognize 23 blood group systems with hundreds of different "types.

Why Do We Have Different Blood Types? - Live Science


Sep 29, 2011 ... Human blood types most likely came to exist to fend off infectious diseases. The incompatibility of some blood types, however, is just an ...

Blood Types - KidsHealth


But they can make the difference between blood being accepted or rejected after a transfusion. So medical experts group blood into types based on the different ...

Why do we have blood types? | Mosaic


Jul 15, 2014 ... Why do 40 per cent of Caucasians have type A blood, while only 27 per cent of Asians do? Where do different blood types come from, and what ...

The Mystery of Human Blood Types | Science | Smithsonian


Oct 22, 2012 ... Everyone's heard of the A, B, AB and O blood types. ... This chart lists the antigens and antibodies made by the different ABO blood types.

Why We Have Different Blood Types | Big Think


Apr 11, 2016 ... After all, what's the evolutionary advantage for having such different blood types? It certainly doesn't do us any favors when receiving a ...

Is everyone's blood different - Answers.com


no blood is typed. Have you ever heard of a blood donation? This is when someone gives ... The four different blood types have been named type 0, A, B, and AB. Type 0 blood has been found to mix safely with all the other types and has been ...

If everybody DNA is different then how blood can match even with ...


Mar 20, 2014 ... We know that everybody's DNA pattern is different in the world. Then how can ´ we transfer blood from one person to another person and this ...

Blood Color in Humans and Animals - Meaning and Function ...


Apr 4, 2016 ... Although human blood is usually red it may have a different color, which ... It's present in everyone's blood but is normally at a very low level.

Everyone's Blood is Not the Same : Arizona DUI Defense Blog


Nov 20, 2007 ... The chemical test assumes that the composition of everyone's blood is ... same amount of alcohol in their body, but different hematocrit levels, ...