You must make a Punnet square.
Â
   E   E
E EE Â Â EE
Â
e  Ee   Ee
(I can't make it, but this is what you fill in)
As you can see, there's two EE and two Ee. Each still has at least one dominant E, so all are dominant. Your answer is a 100% chance they'll have detached earlobes.