Promising youngster JoelMcAnuff was also in the thick of the action, and his speculative long-range drive fizzed past the left-hand post shortly afterwards.
Francis headed a JoelMcAnuff corner wide but just when it looked like it would not be Wimbledon's day, they suddenly drew level with two goals in three minutes.
After Joel Ward replaced Utaka, Reading forward Jobi McAnuff found space but flashed a right-foot drive over the crossbar before David Nugent fluffed a chance to double Pompey's lead by miscuing his volley from 12 yards out.