A genetic cross of inbred snapdragons with red flowers with inbred snapdragons with white flowers resulted in F1-hybrid offspring that all had pink flowers. When the F1 plants were self-pollinated, the resulting F2-generation plants had a phenotypic ratio of 1 red: 2 pink: 1 white. The most likely explanation is what mode of inheritance

Incomplete dominance is a type of inheritance pattern where the heterozygous condition of the alleles leads to the blend of both dominant and recessive alleles phenotype. In this case, red snapdragon and white snapdragon flowers crossed and produced pink flowers, which is a blend of both traits due to incomplete dominance of the red or dominant allele.

In such a pattern, the heterozygous condition only shows the mix or hybrid phenotype and parental phenotypes reappear in F2 when heterozygotes are crossed.