I'm an undergraduate majoring in chemistry. But I'm very much interested in the field of biology too.
Will an internship in biology benefit me, say when I apply for graduate school? I don't yet know what I'll be specialising in later on. If I decide to specialise in biology, then all's good. But what if I stick with something primarily chemistry? Then will it look like I don't have enough experience in chemistry?
Also, can I ask my department's HOD or any other chemistry professor for a recommendation letter while applying for the internship in biology? Since he's a chemistry professor, even if I did ask and he did write me one, will that count for much? After all, it's going to talk about my skills, etc. in chemistry, and not biology.
On the other hand, if I didn't ask him for a recommendation letter and I asked only some of the Life Sciences professors for it, will it be unethical, or would he take offence? ( I have no idea about etiquette regarding these things) I don't want to do something that's going to get me in his bad books.