Question

how are the heriditary changes responsible for evolution

Answer 1

HEY THERE............
HERE IS YOUR ANSWER...........
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☜☆☞ The problem is that hereditary changes, like faster horses in races, are on a scale and can only go so far, because all the traits are already within that species' genes and are on a normal scale. Abnormal changes - like extra feathers or bigger beak in pigeons or short snouts in bulldogs - lead to degeneration of the animal's health if such animals are bred on. Changes such as enlargement of flowers for garden displays eventually return to the smaller natural size (I have tulips in a bowl which started with large flowers but after many years now have small flowers). Some hereditary changes are the result of abnormalities in the chromosomes and are impairing to the individual.
Species we see today do not alter - in fact they are well-suited to their environments. Elephants will only become extinct if their food disappears; they cannot become better elephants to cope with environmental changes. 
This is a problem for the idea of hereditary changes being responsible for evolution and there should be more scientific research to understand how species change.

HOPE MY ANSWER HELPS YOU...........
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Answer 2

hey friend
here is your ans
evolution is the changes ininherited traits of a population from generation to generation. mutation in these genes can produce new and altered traits ,resulting in hereditary changes in organisms. Heredity is the process of passing of traits from one generation to the next generation

hope it help you