Phenotype explanation please!

[Mariaf13]

I have some questions about my recent clutch of bantams. The Roos are gold based buff Colombian Brahma bantams. The hens I think are either Wheaton or also buff Columbian with some diluters? And other feather patterns: mottled, partridge and one I’m not sure about. Also one birchen hen.
The clutch had all buff columbian pullets with some patterning on the feathers, and all birchen cockerels and ONE white columbian cockerel.
The questions I have are:
What are the genetics of the 3 Serama hens, are they Wheaton? Buff?
Is this pairing sex linked? Is that why all the pullets are buff and the cockerels are birchen and columbian?
Are my girls all silver based?
And is it accurate to assume only one hen gave all these buff chicks? I incubated 13 eggs and got 8 chicks, and all of the eggs I incubated SEEMED to be from all 4 hens. But the chicks all look the same.. They’ve been laying for a while and all of them have a specific pigment to the hen, some more pink, some more off white, some darker tan. I’ll attach some pictures of the hens and offspring.

 

[Mariaf13]

 

[Amer]

Your wheaten-based hens are all gold-based (they have gold rather than silver edging on the hackles.)
Therefore the only possible mother for the two cockerels is the silver birchen hen. Columbian doesn't express on the Birchen base, so your Birchen hen is only heterozygous for the Birchen gene. Clearly she is carrying either Wheaten, Partridge, or Duckwing. This explains the het. silver birchen son and the het. silver Columbian son. Her offspring would be sexlinked, she could produce het. silver birchen sons and the het. silver Columbian sons and gold birchen daughters and gold columbian daughters, but that said, that doesn't mean all the chicks are necessarily hers.
Any of the wheaten-based Serama hens could produce gold columbian daughters.

 

[Mariaf13]

Your wheaten-based hens are all gold-based (they have gold rather than silver edging on the hackles.)
Therefore the only possible mother for the two cockerels is the silver birchen hen. Columbian doesn't express on the Birchen base, so your Birchen hen is only heterozygous for the Birchen gene. Clearly she is carrying either Wheaten, Partridge, or Duckwing. This explains the het. silver birchen son and the het. silver Columbian son. Her offspring would be sexlinked, she could produce het. silver birchen sons and the het. silver Columbian sons and gold birchen daughters and gold columbian daughters, but that said, that doesn't mean all the chicks are necessarily hers.
Any of the wheaten-based Serama hens could produce gold columbian daughters.

Thank you!! This explains everything I was confused about. So one last thing- silver columbian- is that what white columbian is called? As in, the white base with black tail and hackles is silver/white, the gold base with black is gold/buff?

 

[Amer]

Thank you!! This explains everything I was confused about. So one last thing- silver columbian- is that what white columbian is called? As in, the white base with black tail and hackles is silver/white, the gold base with black is gold/buff?

Yes. I call them silver columbian and gold columbian rather than columbian and buff columbian. This is because they have the silver and gold genes. Buff is caused by different genes so I think it's confusing to call gold columbian "buff columbian", even though it often is called that.
Technically your cockerels are heterozygous for silver and gold so they should get more yellow leakage as they get older.

 

[Mariaf13]

Yes. I call them silver columbian and gold columbian rather than silver columbian and buff columbian. This is because they have the silver and gold genes. Buff is caused by different genes so I think it's confusing to call gold columbian "buff columbian", even though it often is called that.
Technically your cockerels are heterozygous for silver and gold so they should get more yellow leakage as they get older.

That makes sense!! The black cockerel has started showing gold leakage and the silver has some of that yellow color coming through on his hackles as well. Thank you so much!!

 

[Mariaf13]

Yes. I call them silver columbian and gold columbian rather than columbian and buff columbian. This is because they have the silver and gold genes. Buff is caused by different genes so I think it's confusing to call gold columbian "buff columbian", even though it often is called that.
Technically your cockerels are heterozygous for silver and gold so they should get more yellow leakage as they get older.

Sorry one more thing- the mottled pattern- is there any way to know how that is passed down? Is it recessive? I’ll post photos of the gold columbian pullets tomorrow for reference but they all are showing partridge patterns in their new plumage, but it looks less stripey than the hens I have. And none of them have mottling yet at all, I don’t think they will. The one lighter smooth hen, is she considered partridge? I’ve had a hard time finding Her feather pattern on reference photos on Google and other forums

 

[Amer]

Sorry one more thing- the mottled pattern- is there any way to know how that is passed down? Is it recessive? I’ll post photos of the gold columbian pullets tomorrow for reference but they all are showing partridge patterns in their new plumage, but it looks less stripey than the hens I have. And none of them have mottling yet at all, I don’t think they will. The one lighter smooth hen, is she considered partridge? I’ve had a hard time finding Her feather pattern on reference photos on Google and other forums

Mottling is recessive.
Your lighter hen might have the partridge gene. She could be something like "buff columbian" having the Gold and Columbian genes but also Dilute or ChampagneBlond.
She may be heterozygous for Partridge but I think she has at least one copy of Wheaten based on the washed-out tail. I think the charcoal gene could be responsible for her darkly colored head and neck, but this is speculation, I really don't know.

 

[Mariaf13]

Mottling is recessive.
Your lighter hen might have the partridge gene. She could be something like "buff columbian" having the Gold and Columbian genes but also Dilute or ChampagneBlond.
She may be heterozygous for Partridge but I think she has at least one copy of Wheaten based on the washed-out tail. I think the charcoal gene could be responsible for her darkly colored head and neck, but this is speculation, I really don't know.

Thank you so much, you’ve been so helpful!! I’ve been trying to figure this out on facebook chicken groups, Reddit, etc and you’ve given me the best detailed answers. Really appreciate it

 

[Amer]

Thank you so much, you’ve been so helpful!! I’ve been trying to figure this out on facebook chicken groups, Reddit, etc and you’ve given me the best detailed answers. Really appreciate it

You're welcome!