Chicken Egg Color Genetics Discussion

[Brahma Chicken5000]

Hello everyone, I’m very curious to learn about egg color genetics in chickens. So far I know that the blue egg gene (O) is dominant to the white egg gene (o).
Some of my questions are:
1. Do chickens carry 2 egg genes?
2. Is there a green egg gene?
3. Is there a brown egg gene?
4. If a green egg layer is the offspring of a chicken with the blue egg gene and one with the brown egg gene how is it that Isbars are pure and lay green eggs?

 

[4 ever Orpington]

Hello everyone, I’m very curious to learn about egg color genetics in chickens. So far I know that the blue egg gene (O) is dominant to the white egg gene (o).
Some of my questions are:
1. Do chickens carry 2 egg genes?
2. Is there a green egg gene?
3. Is there a brown egg gene?
4. If a green egg layer is the offspring of a chicken with the blue egg gene and one with the brown egg gene how is it that Isbars are pure and lay green eggs?

 

[Skipper81]

Seems they were a mix of breeds then got name changed to Isbar
From the mix Island Silver Barred here's a link from BYC
https://www.backyardchickens.com/threads/silverudds-blue.1090421/

 

[Brahma Chicken5000]

Seems they were a mix of breeds then got name changed to Isbar
From the mix Island Silver Barred here's a link from BYC
https://www.backyardchickens.com/threads/silverudds-blue.1090421/

Interesting read, but didn’t answer my question. Thanks anyways

 

[Skipper81]

Oh sorry I thought you were asking how they are purbreed and lay green and that thread seemed to say they are mix breed to create there breed

 

[Skipper81]

I am curious if there is a green eggs gene also

 

[Brahma Chicken5000]

Oh sorry I thought you were asking how they are purbreed and lay green and that thread seemed to say they are mix breed to create there breed

I guess what I’m really asking is how they got the green egg to pass down from generation to generation.

 

[Brahma Chicken5000]

I am curious if there is a green eggs gene also

Yes so am I. From what I understand the brown coloring is applied to the blue shell sometime before being laid, but I thought that this could only be achieved by crossing a blue egg breed to a brown egg breed. I think that the offspring will get the blue egg gene (O) because it’s dominant to white (brown eggs are white eggs with brown coloring applied before being laid) and so the offspring of 2 siblings from the above cross would result in a daughter that laid blue eggs
@The Moonshiner can you offer some insight?

 

[Skipper81]

I've gone over the egg color genetic chart a few times and always thought there was something amiss when it comes to the green egg theory
I have orpington americana cross hens laying green eggs so I crossed them with a golden comet rooster(brown egg breed)
To see what I end up with

 

[Brahma Chicken5000]

I've gone over the egg color genetic chart a few times and always thought there was something amiss when it comes to the green egg theory
I have orpington americana cross hens laying green eggs so I crossed them with a golden comet rooster(brown egg breed)
To see what I end up with

Do you have chicks from this cross now?