Why are there different blood groups?

Answer 1

Genetic variation or differences would be the primary factor to give this question an explanation. The same explanation that tells why there are different eye colors, different hair, different skin colors, etc. We inherit our blood type from our parents. Genes on our chromosomes tell the body what type of blood to make.

The types of proteins, glycoproteins and glycolipids found (or expressed) on the surface of red blood cells define blood types. In addition, blood types, or at least the genes responsible for them, are inherited. 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." Many of the blood type antigens (and the antibodies that react with them) have been discovered as a result of transfusion incompatibilities. Some of these molecules have additional functions that are at least as important as conferring compatibility (of lack of compatibility) on transfusion recipients.

There are four popularly known blood types: A, B, AB and O. These designations refer to the types of sugars (A, B and O) found on the surface of red blood cells. Everyone on the planet has an O sugar, and those who have no other type are known as blood group O. The other group names arise from the fact that some people have A, B or both A and B sugars attached to the O sugar.

The genetics is unusual in that there are two equally dominant alleles. If the gene from your mother is the recessive allele for producing O cell surface markers, and the gene from your father is for A cell surface markers, then your overall blood type is A. Why? Since everyone has O we only look at the second sugar present to determine blood type. If the gene from your mother was for B and the gene from your father was A, then your blood type would be AB. If both parents donated A alleles, then you would be A. And if both gave you recessive alleles then your blood type would be O.

>> If we have the genes for the A antigen, we will make red blood cells that have A on them.
>> If we inherit A antigen from both parents or A from one and neither A or B from the other we will have group A blood.
>>If we inherit B antigen from both parents or B from one and neither A or B from the other we will have group B blood.
>>If we inherit A antigen from one parent and B from the other we will have group AB blood.
>>If we inherit neither antigen from both parents we will have group O blood. There is no O antigen. O is the result of not having any A or B.
>>In addition to our blood group (A,B,AB,O) we can inherit the D antigen. D is more commonly know as the Rh type. This is what is called the positive or negative. Either we have it or we don't.
>>If we inherit Rh antigen from both parents or Rh from one and not from the other we will have type positive blood.
>>If we do not inherit the Rh antigen from either parent we will have type negative blood.

There is no much elaboration on non - ABO blood type as there is only a few who got any of the rare identified blood types.☺

Answer 2

if you want an explanation according to the idea that everything in the body has a good purpose, then there is no good reason for there to be many different blood groups, it would be much better if everyone had the same blood group.

if you want an explanation of how it is so that there are different blood groups, its that there are certain molecules on the surface of each blood cell that act as an identity for the blood cell.there are different types of these molecules and different people might have the same or different identity molecules, so that blood from 2 different people can be recognized as the same if they share these molecules or different if they dont, this way some people are able to give blood to others and recieve blood from them,these molecules are the basis for what is known as blood groups.

Answer 3

It would have been one single group if Adam had been bestowed the power of auto-reproduction by binary fission (budding) as is seen in some lower animals and plants, where the offspring is exactly alike, without any differentiation. The moment we bring in Eve or the first female evolving from the Ape (whichever theory we may believe), the combination and thereafter the crossover of genetic material, as happens in meiosis, makes the difference. During the course of evolution, many different permutations and combinations would have occurred and the stable ones would have persisted to give us different types of blood groups.

Answer 4

Its one of nature's mystery. Like each person having different Genes and DNS and body structure, face shapes and a lot more, the blood groups are another of those simple miracles in life. Nobody can explain why there are different blood groups but its obvious that if a person receives a different blood group than his own blood group, he will die instantly. So, just think like our body is designed to accept only a certain type of blood except for the universal taker who can accept any type of blood.

Science is really a miracle and nobody can explain it fully,

Just think, after a person is dead, all their organs die immediately except the Heart, Eyes and the Brain which takes hours to die. Its like shutting down a computer. It has to do everything is a sequential form.

BYE

Answer 5

Blood types only differ because they have different antigens covering there surface apart from O which does not have any... So I would imagine they all taste the same... tasting / drinking blood carries a number of health implications like hepatitis, HIV etc...

Answer 6

You might as well ask why there are different eye colors, or why some peple have curly hair and others don't. Genetic variation.