Cross between Iᴬ i (type A) and Iᴮ i (type B). What blood types can their children have?
- A
Only AB — codominance forces both antigens
- B
Only A and B — only dominant alleles show (1:1)
- C
Only O — both parents pass the i allele
- Dcheck_circle
A, B, AB, and O — all four are possible (1:1:1:1)
Explanation
All four genotypes are possible: Iᴬ Iᴮ (AB), Iᴮ i (B), Iᴬ i (A), i i (O). A classic exception to "you must look like a parent."