if lamarck concept of inheritance of acquried character is true. in the year 1890 august performed an experiment on his theory by cutting the tail of rats for nearly
20 generation but could not find a tailess rat. WHY?
In his famous experiment, August Weismann cut off the tails of mice for 22 generations, and he disproved the theory that acquired characteristics could be inherited.
He proposed the germ plasm theory. This theory explained the body (Somatoplasm) lives for only one generation. But the hereditary material (Germ plasm) is immortal, and it can be passed from generation to generation without change.
That is why, even after 22 generations the rat exists with tails.