How codominant inheritance patterns differ from dominant/recessive inheritance patterns

Its simple dominant and recessive inheritance patterns and organism would need two recessive alleles(rr) for the trait to be expressed but only one dominant allele for that trait to be expressed (RR or Rr) however in the case of co-dominant alleles the heterozygous state (Rr) would produce a third phenotype rather that the dominant phenotype.

Try b? sorry if i’m incorrect

26.4 is about the right time