Genetics is the study of heredity and the variation of inherited characteristics. The reason genetics is important is because it helps scientists study diseases. It also helps them to dig deeper to understand the human body. Studying the body can prevent a population from inheriting a disease. Genetics have a lot to do with evolution. Thanks to our genetics we got to evolve, this process is genetics variation. The way scientists study genetics is using two DNA samples (DNA:nucleic acid that carries the genetic information in cells about you) in the same family members.They spot the differences to see if you have a disease or if you're not even related to them.