**Category:** Genetics  
**Subtype:** Mendelian Inheritance (Dihybrid Cross)  
**Problem Description:** This problem involves determining the expected phenotypic ratios of offspring (F1 generation) from a dihybrid cross between two plants, each with two independent gene pairs (A/a and B/b). The question asks which of the given percentages cannot represent the proportion of offspring exhibiting both dominant traits in the F1 generation.