Question

explain with suitable example why certain traits cannot be passed on next generation

Answer 1

Certain traits cannot be passed on next generation because:

1. Acquired traits which occur in the somatic cells bring about some changes in them.
2. Changes in the somatic cells are not passed on to the offspring belonging to next generation.
3. Only the changes in the genetic material of the reproductive cells can be inherited.
 
e.g. Muscles developed by strenuous exercise cannot be inherited to offspring as these changes occur in somatic cells. These are called as acquired traits  

Answer 2

Ome traits can't be passed to next generation because such traits don't bring any change in DNA of the germ cells.....

Or they takes place in non reproductive tissues

Example.....acquiring knowledge.....change in body weight