When neither gene in a genotype pair is dominant and neither gene is recessive, the genes are said to be multiple alleles incomplete dominant alleles incomplete alleles

The correct answer for the blank is- incomplete dominant alleles .

Incomplete dominance (also known as partial dominance) occurs when a dominant form of a gene does not completely masks the expression of another gene variant ( that is a recessive allele).

In this inheritance, a genotype with heterozygote condition ( with neither a dominant allele nor a recessive allele) results in an intermediate phenotype ( which depicts a blend of phenotypes that lies between the phenotypes of two homozygous parents).

For example- When a snapdragon red flower is crossed with a white flower, it produces pink snapdragon, representing incomplete dominance.