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No two humans are genetically identical. Even monozygotic twins, who develop from one zygote, have infrequent genetic differences due to mutations occurring during development and gene copy number variation has been observed. Differences between individuals, even closely related individuals, are the key to techniques such as genetic fingerprinting. Alleles occur at different frequencies in different human populations, with populations that are more geographically and ancestrally remote tending to differ more.
The structure homology data suggest that the product of RHD gene, the RhD protein, acts as an ion pump of uncertain specificity (CO2 or NH3) and unknown physiological role  . Three recent studies   have reported a protective effect of the RhD-positive phenotype, especially RhD heterozygosity, against the negative effect of latent toxoplasmosis on psychomotor performance of infected subjects. RhD-negative compared to RhD-positive subjects without anamnestic titres of anti-Toxoplasma antibodies have shorter reaction times in tests of simple reaction times. And conversely, RhD-negative subjects with anamnestic titres (i.e. with latent toxoplasmosis) exhibited much longer reaction times than their RhD-positive counterparts. The published data suggested that only the protection of RhD-positive heterozygotes was long term in nature; the protection of RhD-positive homozygotes decreased with duration of the infection while the performance of RhD-negative homozygotes decreased immediately after the infection.
Variation within a species, (as well as variation between species) are one of the things that drives evolution. (Along with the selective "event" that kills off portions of the population.)
We have different blood types because mutations arose, and in various regions, "selective events" killed off large parts of the population who had one or the other mutation, allowing groups of people to amass with one blood type or the other.
There was a question about whether animals have blood types.
Dogs have about 13 different blood groups, with between 6-8 being the major ones, and cats have 3 different types. Blood transfusion are species specific, so dogs can only give to dogs and cat only to cats.
Dogs rarely have iso-antibodies against other blood types, so in most cases, blood typing or cross-matching is not required prior to a first blood transfusion – although ideally a cross match with the recipient dog would be done.
For cats, they are born with iso-antibodies to any blood type which is not their own – so cats need to be blood typed before they are transfused.
Some veterinary hospitals have donor dogs available to give blood, plus there is a canine blood bank at the University of Melbourne – and for more information you can visit the following web-site;
Originally posted by One Moment
I am right there withcha OP! Your query is very poignant!
I believe, no....I know, we are manipulated, created and designed beings originating from off-world entities (see: Annunaki).
I don't even want to go there with anyone so I won't respond in a toe-to-toe with anyone but you know what I find interesting though?
Years ago, a couple could not marry unless and until they had a blood test to supposedly to prove 'they were compatible' to have offspring (in the guise of having retarded children).
Now. What happened to that concern?
It's all BS.
We have been lied to, have had secrets kept from us and have been nothing but walking zombies for millenium now.
We need to rediscover ourselves again and then......the secrets will all be revealed and everything will fall into its proper place.
By the way, personally, I am "O" Rh negative.
Anyone can take my blood from me for I am a universal donor however, I can't take anyones blood but my own type and....there is no scientific reasoning for this.
So.....alien ancestry? You best believe it!
On the other hand, there is some evidence that group O members are more susceptible than other blood type individuals to the agent that causes bubonic plague, whereas group A people are more susceptible to smallpox virus. These correlations may account for the increased frequency of the B gene in China, India and parts of Russia, which suffered epidemics of both of these diseases. Infectious organisms that carry A- and B-like antigens may have indeed played a role in the somewhat different distribution of blood types worldwide.