Question

What is theory of gemplasm and who gave it?

Answer 1

Weismann first proposed this theory in 1883; it was later published in his treatise Das Keimplasma (1892; The Germ-Plasm: A Theory of Heredity). This view contradicted Lamarck's theory of acquired characteristics, which was a prevalent theory of heredity of the time.

Answer 2

August weismann gave this theory