For offspring produced by a particular cross, the ratio of the phenotypes would largely depend on the genotype of their parents. In this regard, it should be noted that each parent should have one allele that would be contributed to the offspring's genotype.
Two plants are crossed, resulting in offspring with a 1:1 phenotype ratio for a particular trait. This suggests _____.
A. that one parent is heterozygous and the other is a homozygous recessive
B. incomplete dominance
C. that the parents were true-breeding for contrasting traits
D. that the parents were both heterozygous
E. that one parent is heterozygous and the other is homozygous dominant