Dom x Normal = 50% showing morph

What my question is if you breed a dominant form to a normal and you get 50% showing are the others het for that morph or are they just normal?
Is it the same with codom and dom.
Ex: Spider x normal = 50% spider 25% het spider 25% normal
Pastel x normal = 50% pastel 50% het pastel
Ive heard spider is a codom morph but if I am wrong please correct me.
Is this correct or am I way off?