Lamarckism:

Lamarckism, also known as Lamarckian evolution, is a discredited theory formulated by the French biologist Jean-Baptiste Lamarck during the early 19th century. It proposes that an organism can pass on acquired traits or characteristics acquired during its lifetime to its offspring, which will then become more adapted to the environment. This theory contrasts with Charles Darwin’s theory of natural selection, which forms the basis of modern evolutionary biology.