Final answer:
The most likely result of a cross demonstrating incomplete dominance would be offspring with an intermediate phenotype, such as pink flowers from a cross between red and white snapdragons. This outcome represents a blending of parental traits, as seen with the 1:2:1 phenotypic ratio for red:pink:white.
Step-by-step explanation:
The most likely result of a cross that demonstrates incomplete dominance in the context of flower color is the production of offspring with an intermediate phenotype. For instance, when a cross occurs between a homozygous red-flowered snapdragon (CRCR) and a homozygous white-flowered snapdragon (CWCW), the F1 generation offspring exhibit pink flowers (CRCW), which is indicative of incomplete dominance. In this case, the phenotype displays intermediate traits, neither red nor white, due to the blending of the dominant and recessive alleles.
In terms of genetic ratios, a self-cross of the heterozygous (pink) snapdragons would yield a genotypic ratio of 1 CRCR:2 CRCW:1 CWCW and a phenotypic ratio of 1:2:1 for red:pink:white flowers. This is because the pigment produced by the red allele (anthocyanin) is diluted in the heterozygote, resulting in the pink flower color when viewed against the white background of the flower petals.