Branch of biology dealing with heredity and variations is
A.Ecology – study of interrelation ship between the living organsims and surrounding environment is called Ecology.
B.Evolution – Study of periodical developments of living organisms since past to present is called evolution.
C.Paleontology – Study of fossils is called Paleontology.
D.Genetics – Study of heredity and variation is called Genetics.
So, the correct option is ‘Genetics’.