Was Mendel's Experiment a Well Controlled One?

Mendel did not set out to conduct the first well-controlled and brilliantly-designed experiments in genetics. His goal was to create hybrid pea plants and observe the outcome. His observations led to more experiments, which led to unusually prescient conclusions.

Why were Mendel's experiments so successful?

The main reason for the success of Mendel was that he took one character at one time in his experiments of hybridization. So it was easy. Other scientists also performed cross-hybridization for many characters, this made the experiments complex and they could not accurately explain the results.

How Did Mendel's experiments disprove?

How did Mendel's experiments disprove the idea that we are simply a "blend" of our parents traits? When he cross fertilized two different colored pea plants, he found that the offspring was one color instead of a mix of two different colors.