Mendel’s work(monohybrid cross & dihybrid cross) did not receive any recognition, remained unnoticed, and unappreciated for several years due to the following reasons:
Communication was not easy in those days and his work could not be widely publicized.
His concept of stable, unblending and discrete units or factors for various traits did not find acceptance from the contemporaries.
His approach of using mathematics and statistical analysis to explain biological phenomena was totally new and unacceptable to many biologists. He could not provide any physical proof for the existence of factors. In 1900, three scientists Hugo de Vries, Carl Correns, and Erich von Tschermark, worked independently on Mendel’s work, proved whatever explained by Mendel on inheritance is true. It is called Rediscovery of Mendel’s laws.