Hi

When one allele for a trait is not able to completely dominate over the other allele, and then the phenotype produced is the mixture of both the alleles , it is known as Incomplete Dominance.

Example:- . Pink roses are the result of incomplete dominance. When red roses, with the dominant red allele, are mated with white roses, with recessive allele then the offspring is heterozygotes and express a pink phenotype

Whereas ,

Co-Dominance is when both the allele for a trait are equally expressed and the resultant phenotype expressed is for both the character equally for both the participating alleles.

Examples of codominance :- type AB blood represents co -dominance as both the A allele and the B allele are equally expressed in type AB blood

Thankyou