Final answer:
Mendel's work on genetics went unrecognized for about 35 years until it was rediscovered in 1900 by other scientists who came to similar conclusions.
Step-by-step explanation:
Gregor Mendel's work was largely unrecognized in the science community for approximately 35 years. Mendel, often referred to as the father of genetics, presented his findings in 1865 and published them in 1866. His groundbreaking research on pea plants described how traits are transmitted from parents to offspring. However, the scientific community of his time adhered to the blending theory of inheritance and Mendel's discoveries were ignored. It was not until the year 1900 that Mendel's laws were rediscovered by scientists such as Hugo De Vries, Carl Correns, and Erich Von Tschermak-Seysenegg, who were on the verge of discovering the chromosomal basis of heredity.