Co-dominance:
Co-dominance is a genetic concept that refers to a situation where both alleles of a gene are equally expressed in the phenotype of the organism. In other words, neither allele is dominant over the other, and both are expressed to the same degree. This results in a phenotype that displays the traits of both alleles in a distinct way.

Examples:
A classic example of co-dominance is the blood type system in humans. In this system, there are three alleles that determine blood type: A, B, and O. Both A and B are co-dominant, meaning that if an individual inherits one copy of the A allele from one parent and one copy of the B allele from the other parent, they will have a blood type that expresses both A and B antigens (AB blood type). If an individual inherits two copies of the A allele, they will have the A blood type, and if they inherit two copies of the B allele, they will have the B blood type. If they inherit two copies of the O allele, they will have the O blood type, which does not express either A or B antigens.

Another example is the coat color of cattle. In this case, there are two alleles that control coat color: red and white. When a cow inherits one copy of the red allele and one copy of the white allele, they will have a coat that is both red and white, rather than a coat that is a blend of the two colors.

Incomplete dominance:
Incomplete dominance is a genetic concept that refers to a situation where neither allele of a gene is dominant over the other, resulting in a phenotype that is a blend of the two alleles.

Examples:
A classic example of incomplete dominance is the flower color of snapdragons. In this case, there are two alleles that control flower color: red and white. When a plant inherits one copy of the red allele and one copy of the white allele, they will have flowers that are pink, rather than a blend of red and white.

Another example is the coat color of chickens. In this case, there are two alleles that control coat color: black and white. When a chicken inherits one copy of the black allele and one copy of the white allele, they will have feathers that are gray, rather than a blend of black and white.