Some allergies can be related to genetic conditions, however most of them can easily be fixed by what you eat and the environment you live in.
For example, some conditions to have allergies to seafood can be caused by genetics, however being allergic to dust and polen can be due to the enviroment.
Curing allergies can be quite simple. If it is a genetic problem all you have to do is see a doctor and look for possible medicines to help. Now if the causes simply related to the environment simply try to get rid of things that may caus it (such as rugs, teddy bears, etc.)