Cayuga genes

[Duckie doodle]

Hi all
What I would like to know is what would offspring be from a black cayuga drake to a blue cayuga? I also want to know what chances are of having green beak instead of black beak? The drake beak is more green then black. The blue cayuga has a double recessive so I don't really understand that either. Thanks in advance.

 

[DiYMama540]

Try posting on the duck forum, should get a better response there!