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Not all human blood are equal thanks to the antigens that prefer to strap themselves onto surfaces of cells. They are like a signal flare to inform soldiers whether target is friendly or not, most of the time the intelligence is accurate. I want only a specific blood type for humanity and I'm confused between type O and type AB, which is preferred medically? How to go about it with minimum casualty and within a decade time? Answer with the least casualties, lowest budget and shortest time frame wins(you may throw ethics out the window).

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closed as too broad by Zxyrra, James, Aify, Mołot, Azuaron Feb 6 '17 at 14:44

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Asking how to make the entire human population have only one blood type in the shortest time with the least deaths and lowest budget ... is very broad. Answers will be incredibly long to cover all these bases, and no two people will have the same idea for how to do it! Consider narrowing the question. $\endgroup$ – Zxyrra Feb 6 '17 at 4:55
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    $\begingroup$ And don't forget that you also must make everybody Rh negative, or at least have everybody manifest the same Rh factors. $\endgroup$ – AlexP Feb 6 '17 at 8:21
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A population of type AB is not stable. Given a uniform population of type AB, the next generation will be 25% type-A, 25% type-B, 50% AB.

A population containing only type-O will be stable as each generation will continue to be type-O.

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  • $\begingroup$ More precisely, IMO, 25% A-A, 25% B-B... $\endgroup$ – DJohnM Feb 6 '17 at 5:41
  • $\begingroup$ If the whole populace went to B only or A only, would that be stable? Or would you still get some Os? $\endgroup$ – SRM Feb 6 '17 at 6:44
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    $\begingroup$ @SRM Depends. If you would make everyone generically A-A, it would be stable. If you will have some A-0, it wouldn't. $\endgroup$ – Mołot Feb 6 '17 at 6:51
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    $\begingroup$ @SRM You should read up on Phenotype vs Genotype. $\endgroup$ – Aron Feb 6 '17 at 7:24
  • $\begingroup$ @SRM If you started out with 100% AB, and then culled the population to get only A or B, then anyone with type-A would be AA and anyone with type-B would be BB. Starting with a full population of AB, A, B, O, it would take genetic testing to determine whether type-A is AA or AO. $\endgroup$ – Michael Richardson Feb 6 '17 at 15:27
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  1. Enable word level government
  2. Forbid reproduction to those who do not have 0 blood type.
  3. Wait until the reaper does it job.

Btw, the only reason why 0 is preferred is because it is more compatible with other types: 0 Rh - has no "labels", to raise alarms, so anybody can accept it. AB Rh + instead has so many "labels" (A, B and +) that can be accepted only by those having all the 3 of them.

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