Final answer:
The blending model of inheritance would eventually eliminate phenotypic variation within a species over time, as distinct traits would blend into uniformity rather than being passed on as discrete units.
Step-by-step explanation:
One outcome of the blending model of inheritance would be that there would be no phenotypic variation left within a species over time. Mendel's work eventually disproved this model by showing that traits are inherited as distinct units rather than being blended. His experiments with pea plants demonstrated discontinuous variation, which is the variation seen among individuals when each individual shows one of two or very few easily distinguishable traits. If the blending model were accurate, over generations, the distinct variations Mendel observed would not have persisted. Instead, blending would have led to uniformity, eliminating variation that is crucial for natural selection.