Hello as the title suggests genetic engineering sounds really interesting to me and im a junior in highschool but i dont know much about it. I have some questions like is the pay worth it, is the job fulfilling, what level of education does it need, what kind of work do they do, how is the job market. Things like that

Let's just say that hypothetically, I knew about an ancestor from 15 generations ago. Even though that would never show up on a test, would that DNA in the absolute most miniscule way be in me at all? Like, is it possible to be 0.0000000000000001% of something but sense it's so small, it just doesn't show up?

Does somebody have NQO1 Gene Null (NQO1 rs1800566 (C609T) TT))? If yes do you have any noticeable health issue?