Why was Gregor Mendel given the title "The Father Of Genetics" ?

Gregor Mendel was considered as the father of genetics because he was the first one to understand how DNA worked. Mendel was famous for working with pea plants. He breeded different kinds of pea plants to get certain kinds of colors of peas.

Just like artists it took him to die for people to really listen to his theory. Luckily other scientists have proved his theory.
- from wikianswers

Hope this helps!!