I am trying to clone 3kb gene into pGEM-Teasy . To amplify the insert , i am using pfu , so i do poly(A) tailing. I am taking 135ng/ul of amplified gene to add poly(A) tailing. After that , i am taking 1: 3 vector to insert ratio. Inspite of all this , i am getting more blue colonies with little number of white false colonies. pls help me in cloning