How many genotypes and phenotypes are possible with incomplete dominance?

two

Incomplete dominance occurs when two heterozygous alleles are expressed together in the phenotype of an organism. The distinct phenotypes produced by each allele are blended together into a third phenotype. In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype. A cross of two F1 hybrids, heterozygous for a single trait that displays incomplete dominance is predicted to give a 1:2:1 ratio among both the genotypes and phenotypes of the offspring.

the answer is :