What is the study of heredity called?

The study of heredity is called genetics.
Genetics is a branch of biology that deals with the transmission and variation of inherited characteristics. It also refers to the genetic makeup of a specific individual or specie.

DNA is a biopolymer of deoxyribonucleic acid Ia type of nucleic acid) that has four different chemical groups known as bases – adenine, guanine, cytosine and thymine. It is a part of a person that has a genetic origin.

Biology is a branch of science that deals with the study of living organisms. It studies the structure, function and behaviour of an organism or type of organism.