White eye .... one gene ... or two ?

[Dany12]

Some say that this peacock has only ONE white eye gene.

If he had two, all his tail would be white eyed!
True .... not true?

 

[Rosa moschata]

That last pic with the chromosomes has several errors.

 

[Dany12]

.... like ... !

 

[Rosa moschata]

It makes no distinction between single-factor WE and double-factor WE.

A bird can't be "split to Silver-Pied", since "Silver Pied" is not just one mutation. A Silver-Pied bird will have one White mutation, one Pied mutation, and be double-factor WE. Being "split" to something means you have one copy of all the necessary ingredients, rather than two. In a single-mutation expression, like Bronze, that means one chromosome has the Bronze mutation, while the other has the "normal" version of the gene. Since Silver-Pied is the result of being heterozygous for White and Pied, plus being double-factor WE, you simply can't have "half" the ingredients. You can have one copy of White, which is "split to White". You can have one copy of Pied, which is "split to Pied." But you can't have one copy of White AND one copy of Pied and NOT be "Pied".

What is "White-Eye Dark Silver-Pied"? I understand that a bird can be homozygous for Pied and be double-factor WE, but I thought the "Silver-Pied" description was restricted to birds that are Pied plus double-factor WE. Is there a difference between the author's term "White-Eye Dark Silver-Pied" and what I'd call "Dark-Pied double-factor WE"?

Oh, well.....not my problem to sort out.

 

[Dany12]

Silver pied WE .... no need to say WE because all Silver pied are WE
Dark silver pied WE ... no need to say WE because all the dark silver pied are WE!

How can one explain that some SP are very white and others less?

How to explain the silvering?
Here dark SP .... with silvering :