The default configuration now allows members of the wheel group to authenticate for administrative actions using their own password instead of asking for the root password. The default policy is defined in
In the users panel of GNOME Settings, you can configure an account to an Administrator. When you first create the user during the GNOME Initial Setup, by default, you will create an Administrator account (a member of the wheel group).
sudo users are allowed to run programs with the security privileges of another user, Administrator is a member of the wheel group providing additional special system privileges that empower a user to execute restricted commands.