Hello. I´m new in the world of genetic of flies and I`m working with crosses. I have one strain with Hf/Cyo on the second chromosome. What HF is specifically? It`s a marker? What kind of marker? Can I see it like Cyo? Thanks!
My guess is that it is a typo, and your stock has If-1, Irregular facets. it is listed in flybase as an allele of Kr (Kruppel). The eyes will look a bit like Bar.