Dear student.
I guess, you want to know whether the all the eggs can develop embryo in case of hen.
Hen can lay both fertilized & unfertilized eggs. A hen can lay eggs irrespective of the presence of a rooster (cock), the eggs are then called unfertilized eggs and will never possibly give rise to a baby chick. The eggs are called fertilized eggs when the rooster has mated with the hen and the eggs hatch to give rise to baby chick.
Regards.