Incomplete dominance is a type of non-mendelian inheritance pattern in which one allele of a gene is not dominant or recessive to the other allele, hence, both alleles combine to form a third intermediate phenotype, which is a blending of both parental phenotypes.
In this case, a red bird (RR) mates with a white bird (WW) to produce offsprings that have pink feathers (RW). This shows that the allele for red coloration is incompletely dominant to the allele for white coloration, hence, both combines to produce a PINK (RW) intermediate phenotype. This portrays incomplete dominance.
