807
A heart-warming story (lemmy.world)
submitted 8 months ago by to c/lemmyshitpost@lemmy.world
52 comments fedilink hide all child comments
 
you are viewing a single comment's thread
view the rest of the comments
[–] 2 points 8 months ago (4 children)

Isn't O the most common type?

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 4 child comments
    •
  • [–] 4 points 8 months ago* (last edited 8 months ago) (3 children)

    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.

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 3 child comments
    •
  • [–] 10 points 8 months ago* (1 child)

    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

  • permalink
  • fedilink
  • source
  • parent
  • hideshow 1 child comment
    •