Question

in blood typing, the \o\ allele is always recessive.
true
false

Explanation:

In blood typing (ABO system), the alleles for A (I^A) and B (I^B) are codominant, while the O allele (i) is recessive. This means the O allele is only expressed phenotypically when there are two copies (homozygous recessive, ii), as it is masked by A or B alleles in heterozygous conditions (e.g., I^A i shows blood type A, I^B i shows blood type B). So the statement is true.

Answer:

True