Answer:
Incomplete dominance occurs when the dominant allele did not completely mask the effect of the recessive allele so that, the recessive allele could manifest some of its traits.Therefore the offspring exhibits some phenotype which reflects the blends of the two traits.( four O'clock flower)
However, in co-dominance(e.g AB blood group) none of the dominant allele is completely dominant over one another.That is the two allele of the same gene are present in the same offspring.Therefore the alleles shows their dominating effects, in the offspring, but no blend of the alleles as in the incomplete allele.
Step-by-step explanation: