do people with AB blood still carry O allele??
is their genotype like iab and io
or is it ia and ib
2007-12-05 11:19:02 · 2 answers · asked by gous f 1 in Science & Mathematics ➔ Biology
A and B are dominant to O. You can be an A or a B and still carry an O allele iAiO iBiO but you can't have an O allele if you are an AB iAiB.
2007-12-05 11:29:22 · answer #1 · answered by Caro_21 2 · 0⤊ 0⤋
No. There is no gene for 'AB' blood. Such people have an 'A' gene and a 'B' gene, and they're both being expressed at the same time!
Technically, A and B are both proteins that appear on blood cells. There is no O protein... that's just a place-holder we use. It's those proteins that your immune system looks at to tell if something doesn't belong.
That's why a type O person is the 'universal donor' - they don't have any proteins on blood cells that would make anyone's immune system nervous. That's also why someone with an A and an O gene has the same blood type as someone with two A genes.
2007-12-05 19:25:18 · answer #2 · answered by Doctor Why 7 · 1⤊ 0⤋