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For this answer we will assume "cross allergies" refers to cross-reactivity. Allergies are caused by your body recognizing something as "foreign." Your immune system produces antibodies to recognize these. Although the actual process of creating antibodies is slightly more complicated, they essentially recognize foreign objects by chemical "shape" and attach to them. Once an antibody is attached, the body's immune system can use various tools to try to take care of or get rid of the foreign item. If the antibodies come into contact with another item that has a similar "shape," cross-reactivity occurs because once the antibody is attached, your body assumes it has attached to the original allergy-causing item. This cross-reactivity is what causes cross allergies.
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