Well bearing in mind that geneticists are usually a bit, shall we say, particular (i dont wanna say arrogant), it is usually best to have a degree in genetics, molecular genetics or molecular biology. Chemistry should put you in a good position regardless; it gets a lot of respect because most biologists are crap at chemistry. It also depends on where you wanna go. Also these days it is important to have very sound data handling/stats skills cos thats what its all about at the moment - loads of data but what does it mean?