The Effect of External Influences upon Development

August Weismann (1834–1914) was a German biologist renowned for his significant contributions to the field of evolutionary biology and embryology. Born on January 17 in Frankfurt am Main, Germany, Weismann embarked on a journey in science that led him to challenge preconceived notions about inheritance and development. He is most notably attributed with formulating the 'germ plasm' theory of hered...