How could you recognize co-dominance?

The correct answer is - the heterozygous organism will express phenotypes of both homozygous alleles.

Explanation:

Co-dominance is the phenomena of genetics in which both alleles are expressed in the offspring together. The co-dominance is the the inheritance pattern in which phenotype of both allele express in the offspring in equal level. There is either no complete dominance or incomplete dominance of one character on other.

Thus, the correct answer is - the heterozygous organism will express phenotypes of both homozygous alleles.