Genetics is the study of the traits people and other animals inherit from their family through DNA.
Compare the size of your nose to your father's and you are dealing with genetics — but only if he's your biological father. Genetics involves studying genes — DNA — to look at how organisms evolve and are related. Scientists use genetics to prove whether genes for things like depression or intelligence exist. One of the most commonly discussed examples of genetics is what determines if a man will lose his hair: oddly, men inherit the baldness gene from their mothers, not their fathers.