Gouldians - Blue hen + split for blue yellow cock = ?

[nixity]

Back to my yellow/split blue cock + blue hen, the genetics calculator has caused some confusion with what debbie said.

According to the calculator, if the yellow cock is single factor or double factor makes a big difference on the colours of the offspring. How can I tell if the cock is single factor or double factor?

So far the offspring that came from him, out of 5 of them, 2 appear to be silver, 2 have a green colour back, and one has a dark grey back. Does this help in learning if he is double or single factor? From what I can see, a DF yellow cock would have not resulted in any green coloured chicks as it's not possible.

A SF yellow cock would result in both green normal split for blues or dilutes, which means the greenbacks in my nest could be either?

If the father is Yellow and the mother is Silver the only way to get green offspring is if the father is SF Yellow, you are correct.

The greenback offspring would only be female.
You can get Dilutes, too, and they are pretty easy to distinguish once they are feathered out.

Dilute on Right, Normal in Center, Blue at top and bottom


So the dark grey baby you are seeing is a Blue, and it would also be a hen.

[finchbob]

The father is yellow and the mother is blue, not silver.

[nixity]

Sorry, I mis-read that..
Then the Normals and Blues could be either male or female, in that case, but your male would still have to be SF Yellow in order to produce both of the above.

A DF Yellow/Blue Male x Blue hen would only be able to produce Dilute/Blue and Pastel Blue Males and Yellow/Blue and Silver hens.