this post was submitted on 16 Feb 2026
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No. O is rarest. The chromosome pairs are made of A,B,O. A & B are Dominant, O is recessive. If I've done the math right, there's 144 ways to combine the genes of parents giving a resulting distribution of
A 33.3%
B 33.3%
AB 22.2%
O 11.1%
Because AA, AO, OA all result in type A... BB, BO, OB all result in type B... AB and BA both result in type AB... Only OO can produce type O blood.
Edit: I assumed even distribution of alleles, which is incorrect as pointed out below.
I googled and multiple sources say O+ is the most common type at around 37-39% of the population. You are right about how the genes work but if the majority have two O alleles, then type O is going to propagate and stay common. It also means a lot of people with type A or B are carriers for the O gene and have children with type O. Your math assumes even distribution of all 3 genes
Good points well made.
Just because something is genetically recessive doesn't mean the gene is rare in a population.
O+ is the most common blood type in many countries, including the US.
https://en.wikipedia.org/wiki/Blood_type_distribution_by_country