A scientist who studies heredity is called a geneticist. Geneticists study genetics in general, which includes heredity. A scientist that studies heredity is called a geneticist. They study general genetics. Heredity is the genetic transfer of characteristics from generation to another.
There is no relationship between heredity and intelligence. Heredity is genes passed down from your biological parents and intelligence is how smart you are, or, how much time you put into school. If you do not study, you will not be intelligent, if you do study, then you will be intelligent.