What were DeVries Correns and Tschermak-Seysenegg wrong about?

DeVries, Correns, and Tschermak-Seysenegg were instrumental in the rediscovery of Mendelian inheritance, but they mistakenly believed that their findings disproved the blending theory of inheritance. They emphasized the role of discrete factors (now known as genes) without fully understanding the complexities of genetic variation and the influence of environmental factors. Additionally, they did not recognize the significance of alleles and the mechanisms of dominance and recessiveness, which later became crucial to modern genetics.