In what year were Mendel's laws rediscovered?

Mendel’s laws were rediscovered in 1900.

Gregor Mendel’s 1866 paper had received little scientific attention, and his explanation of heredity was largely forgotten for more than three decades. Around the turn of the century, botanists investigating how traits were inherited began reaching conclusions that closely matched Mendel’s work.

Hugo de Vries in the Netherlands and Carl Correns in Germany independently reproduced important parts of Mendel’s findings. Erich von Tschermak was also initially credited, although later historians have questioned whether he fully understood Mendel’s laws. The term “rediscovery” therefore refers to a cluster of publications and experiments rather than one single event.

The renewed interest helped establish genetics as a scientific field. Researchers began replacing the older idea of blending inheritance with a model in which inherited factors remain distinct and are passed on according to identifiable rules. William Bateson later promoted Mendelism and helped popularize the emerging vocabulary of genetics.