A man of blood group A (genotype I$^A$i) marries a woman of blood group B (genotype I$^B$i). Which blood groups are possible among their children?
AA and B only
BA, B, AB and OCORRECT
CAB only
DA and O only
JUPEBBiologyGenetics
AI
Toaster Teacher
Why the answer is B, and why the others tempt you.
Gametes I$^A$ and i from the father combine with I$^B$ and i from the mother, giving I$^A$I$^B$ (AB), I$^A$i (A), I$^B$i (B) and ii (O), each with probability one quarter. This cross shows codominance of I$^A$ and I$^B$ and recessiveness of i.
Want this in Pidgin, Yoruba, Igbo or Hausa? Sign up free →
Practice more Biology questions
JUPEB Biology has thousands more questions like this — with Worked answers on every one.