Final answer:
In chickens, the appearance of speckled coloring as a result of crossing black and white chickens exemplifies codominance, where both colors are visibly expressed in the offspring.
Step-by-step explanation:
In chickens, the presence of three colors, black, white, and speckled, is a classic example of codominance in genetic inheritance. Codominance occurs when the phenotypes of both alleles are expressed in the heterozygote. This type of inheritance is distinct from the incomplete dominance, where the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. The example where black and white chickens produce speckled offspring fits the codominance pattern, not incomplete dominance, complete dominance, or multiple alleles. Another example of codominance is the ABO blood group system in humans, where both A and B alleles are equally expressed resulting in AB blood type.