Write in a paragraph on how littering can be fixed

The given question is incorrect as the mixture of the phenotypes occurs in incomplete dominance thus, the correct question is-

In incomplete dominance, a heterozygous has a/n blank phenotype mixing both of its parent's phenotypes together

The correct answer is - intermediate.

Explanation:

Incomplete dominance is different from complete dominance and codominance pattern of inheritance. In complete dominance, the dominant allele masks the recessive allele of the trait in heterozygous conditions.

In codominance, both alleles express themselves if present together whereas in incomplete dominance an intermediate phenotype express by mixing of both of its parent's phenotype. In incomplete dominance dominant allele is not completely mask the recessive allele and express an intermediate phenotype.