Quote From TreeofLife:
Most of the people on this forum are not in the US so it may be difficult for you to get many replied to this question.
I am in the US currently, and from informal discussions with people I have been told that GPA and GRE are not the main considerations (as long as you meet the basic criteria) and it is really about who you know and how good your references/lab experiences are, so you should be ok.
I second that- I know quite a bit about the States as my brother is doing a PhD there and it's all about connections/references pretty much. I would say GPA has a greater influence than GRE- GRE is only relevant if you're doing a maths intensive subject and top departments want to make sure you are in the 90th percentile plus. Focus on having a good proposal and getting in touch with faculty members.