Question

Why are acquired characters not transmitted to next generation

Answer 1

Acquired traits as the name says are acquired by the individual during its life time. Acquired traits are due to changes in the life style, injury, loss of body parts, disuse of some body parts. These are the traits which occur in the somatic cells. Changes in the somatic cells are not passed on to the offspring belonging to next generation.Hence acquired traits cannot be passed on to next generation. 
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Answer 2

Acquired characters are those that any individual gets during its lifetime, for example, biceps develop due to exercise and bruises or wounds from any injury. These characters are only present in one individual and are not passed to next generation because only those characters are transmitted to next generation that are carried on genes in the gonads. If any mutation occurs in the DNA during the life of individual, it will be passed onto next generation. Changes in somatic cells are not passed on to offsprings.