Answer with Explanation:
The large sample size allowed Gregor Mendel to make comparisons quantitatively. The "margin of error" is narrower and it allowed him to detect statistically significant results through its statistical power. Large sample sizes have a greater statistical power. However, it takes a lot of time, effort and money. Mendel was very persistent and had the driving force. This allowed him to develop the "Three Principles of Inheritance."
A smaller sample size doesn't give a significant difference because the samples are quite random. This has a tendency to mask the result.