Because I want to know?

All you really need is a good method for research.

You can major in biology and physiology and chemistry, and study DNA.
Or statistics and math, and study clades and haplogroups.
Or anthropology, sociology, and historical movements of peoples.

Genealogy isn't enough of a field of expertise by itself - anyone can do it.

Genealogy is a hobby, not a vocation, though some may try to make a living at it. But there is no accredited university degree for it.

And what is the purpose of your question, you have posted several with "because I want to know" Can you come back and give us more information.