S.No

Lamarckism

Neo-Lamarckism

1.

It refers of the original

It refers to the modified version of Lamarck's theory

theory of Lamarck.

(Lamarck's views + new facts).

2.

It has inner will and use and disuse

It does not include these factors.

of organs as postulates.

3.

It does not differentiate between somatic

It differentiates between somatic cells and germ cells.

cells and germ cells.

4.

It holds that all acquired characters

It holds that only the variations affecting

are inheritable.

germ cells are inheritable.