Why are traits acquired during the life-time of an individual not inherited?

Q. Why are traits acquired during the life-time of an individual not inherited?

Answer:- 

The germ cells of sexually reproducing populations are made in specialized reproductive tissue. Change in non-reproductive tissues, on account of acquired traits, cannot be passed on to the DNA of the germ cells. Therefore, experience gained or traits acquired during the life-time of an individual not inherited. For example, Offspring of an hockey player may not be a hockey player.