Final answer:
The breeding of a blue-colored and a yellow-colored salamander resulting in green-colored offspring is an example of incomplete dominance, a genetic phenomenon where the offspring's phenotype is a blend of the parents' phenotypes.
Step-by-step explanation:
A blue-colored salamander breeding with a yellow-colored salamander of the same species results in green-colored offspring. This scenario is illustrative of incomplete dominance, which is a form of inheritance wherein the offspring's phenotype is a mix of the parents' phenotypes, resulting in a third, intermediate phenotype. An example of this can be observed in snapdragons, where crossing red and white flowers results in pink offspring.
In contrast, codominance occurs when both alleles for a trait are fully expressed, as seen in human blood types MN, where both the M and N alleles are equally expressed in heterozygotes. Epistasis involves one gene affecting the expression of another gene, such as in the case of pigmentation in mice, where the presence of a specific allele can completely mask the expression of another gene's alleles.