Comment on A heart-warming story

• napoleonsdumbcousin@feddit.org ⁨4⁩ ⁨hours⁩ ago

  O+ is common, but O- is rare.

  A person with O- can only receive O- blood.

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  • FreshParsnip@lemmy.ca ⁨4⁩ ⁨hours⁩ ago

    Thank you for the clarification

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• deltapi@lemmy.world ⁨3⁩ ⁨hours⁩ ago

  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.

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  • FreshParsnip@lemmy.ca ⁨3⁩ ⁨hours⁩ ago

    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 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

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    • deltapi@lemmy.world ⁨2⁩ ⁨hours⁩ ago

      Good points well made.

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  • Shrubbery@piefed.social ⁨2⁩ ⁨hours⁩ ago

    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

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