It is awesome that you are interested in these things! There are a lot of different opportunities out there and the field is ever growing.
My recommendation as to what you should study is dependent on how your first year in college goes. The great thing about college is that you may enter thinking one thing and end up doing something completely different. For someone entering, you should not put so much emphasis on exactly what major you are going to study. You should have a good idea on what field you are interested in, as in your case genetics, and begin to take classes along that path. You may be surprised and realize you like another type of biology or something else related to the field. As long as you are in the area you are interested in things will work out. So to summarize, put down a major you are interested and begin taking the core classes, but keep an open mind.
If you really like genetics, then look at the majors Genetics, Molecular Biology, or Bioinformatics.