No.
What I heard from my lawyer (and some of other lawyers since I\'m looking for lawyers recently), you can have only ONE I 485 application submmitted to INS. You can not have two I 485 application co-existed in the same time.
Actually, you two ARE already protected.
You may submit your I 485 and have your wife as a derivative from your case if you reach the I 485 stage earlier, and wait until it gets approved or rejected. During this period, if your wife\'s application reaches I 485 stage, just ask the lawyer to hold one until the former application gets approved or rejected.
If in the worst case, it gets rejected, your wife may proceed with another I 485, which is that she is the main applicant and you as the derivative.
Hope this helps.
Joan