The branch of science which deals with resemblances, origin and expression of biological variations is called

The branch of science that deals with resemblances, origin, and expression of biological variations is called genetics. Genetics is the study of genes, heredity, and genetic variation in living organisms. It encompasses many different fields, including molecular biology, biochemistry, and genomics, and is concerned with understanding how genetic information is passed from parents to offspring, how it is expressed in different organisms, and how it gives rise to variations in traits. Geneticists study the structure and function of genes, the mechanisms of inheritance, and how genetic variations can lead to diseases or affect the characteristics of an organism. They also investigate how genetic information can be used to improve agriculture, medicine, and biotechnology.