Before revision: During a period of seven years (1856 to 1863), Mendel cultivated and tested some 29,000 pea plants which lead to him deducing the two famous generalizations known as Mendel's Laws of Heredity.
After revision: During a period of seven years (1856 to 1863), Mendel cultivated and tested some 29,000 pea plants which led to him deducing the two famous generalizations known as Mendel's Laws of Heredity.