hi, my school have recommended for EPQ to make sure there is a question being asked in your title. im no expert at genetics but something along the lines of “Do genetic variations contribute to schizophrenia”. An example of this in a different topic could be ”Has advertising around gambling changed since 1900” it’ll give you an argument to prove and help it be more specific
id also suggest you look into the available literature about that topic, as it seems quite niche and you need to have stuff to research, especially since you’ll be reliant on secondary research (what other people have done). if there’s limited stuff avaialble (on things like google scholar) it might be necessary to change to a more researched topic