Final answer:
The phenotypic ratio expected from a cross between parents heterozygous for a character with complete dominance is 3:1.
Step-by-step explanation:
The phenotypic ratio expected from a cross between parents heterozygous for a character with complete dominance is 3:1. This means that for every 3 offspring with the dominant phenotype, there would be 1 offspring with the recessive phenotype.
For example, if the dominant phenotype is represented as A and the recessive phenotype is represented as a, the genotypes of the parents would be Aa. The possible genotypes of the offspring would be AA, Aa, and aa.
Since complete dominance means that the dominant allele masks the expression of the recessive allele, the heterozygous offspring (Aa) would exhibit the dominant phenotype. Therefore, the phenotypic ratio would be 3:1.