Original: His main contribution was the germ plasm theory, according to which (in a multicellular organism) inheritance only takes place by means of the germ cellsâ "the gametes such as egg cells and sperm cells.
Simplified: Weismann advocated the germ plasm theory, according to which (in a multicellular organism) inheritance only takes place by means of the germ cellsâ "the gametes such as egg cells and sperm cells.