$A$ man with blood group $A$ marries a woman with blood group $O$ and their daughter has blood group $O$. Is this information enough to tell you which of the traits - blood group $A$ or $O$ - is dominant? Why or why not?

(N/A) No. This information is not sufficient to determine which of the traits - blood group $A$ or $O$ - is dominant.
Blood group $A$ can be genotypically $I^A I^A$ (homozygous) or $I^A i$ (heterozygous),while blood group $O$ is always $ii$ (homozygous recessive).
Since the daughter has blood group $O$ $(ii)$,she must have inherited one $i$ allele from the father and one $i$ allele from the mother. This confirms the father is heterozygous $(I^A i)$.
However,this single cross does not provide enough data to establish dominance patterns across a population,as we do not know the genotypes of all potential progeny or the expression of other combinations.