Admissions are complex since there is such variety in applicant GPA, MCAT, degrees, work history, achievments, volunteering, personality, etc. All other things being equal they might prefer the applicant with a Bachelor's degree. All other things are usually not equal though, so if you're around 25 or older, I would just apply and see what happens. If you're still in your early 20s then you may as well just buckle down and finish the degree regardless, because if you get the whim to pick up a Master's degree or PhD or switch to MD/DO, you would almost assuredly need a Bachelor's for any of those things—so finishing off the degree now leaves you with many more potential future opportunities.
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