egg color genetics question

[tjb]

I have a beautiful white rooster that is a Sapphire Super Blue. I incubated eggs that were EE hens {blue/blue green eggs} from him. If I keep one of the rooster offspring from the pair, will he carry the blue gene for the next generation pullets?

 

[The Moonshiner]

Maybe and maybe not.
He carries one gene for blue and one for non blue (white)
Your hens sound like they all carry at least one blue gene but no way of knowing what the other gene is.
The ones that lay green are almost surely not pure for blue.
You really can't be sure what one of the cockerels will get but it is guaranteed your rooster will not pass blue gene to all his offspring. Just from his side they would be about a 50/50 split for blue/ white

 

[tjb]

Maybe and maybe not.
He carries one gene for blue and one for non blue (white)
Your hens sound like they all carry at least one blue gene but no way of knowing what the other gene is.
The ones that lay green are almost surely not pure for blue.
You really can't be sure what one of the cockerels will get but it is guaranteed your rooster will not pass blue gene to all his offspring. Just from his side they would be about a 50/50 split for blue/ white

Thank you... my rooster is having behavior issues and I was debating whether to replace him with his offspring from the blue egg EE hen, however, I do not want to give up the the blue gene.

 

[nicalandia]

my rooster is having behavior issues and I was debating whether to replace him with his offspring from the blue egg EE hen, however, I do not want to give up the the blue gene.

The Sapphire Super blue is a cross between a CCL and a White leghorn, both the hens and the roosters get one copy of the blue egg shell gene(Linked to the single comb from CCL), so he has 50% chance of passing his blue egg shell gene to his progeny, on the other hand we have a EE hen that is laying blue eggs, they have at least one copy of the blue egg shell gene(linked to the pea comb), they themselves have also 50% chance of passing the blue egg shell gene to their progeny, but due to linkage of the blue egg shell gene to either the pea comb(on EEs, Ameraucanas, Araucanas) or to the single comb gene(CCL, Isbars) the chances will vary greatly

Lets calculate the odds of any roosters from that cross to inherit at least one copy of the blue egg shell gene.

Any males from that cross that hatch with a pea comb has about 96% chance that will inherit the blue egg shell gene from its EE mother(at least one copy of the blue egg shell gene)

Any single comb males from that cross will have varying odds, the odds will be from 50%(if they inherited the single comb that is linked to the blue egg shell gene and the the non recombinant single comb from EE dame), to 4%(if they inherited a recombinant single comb gene from either EE or from the Sapphire, the chance is the same)

so odds are against you if you decide to keep a single comb male from that cross, my advise is to keep the best male from that cross that has a pea comb.

 

[tjb]

Would this be a peacomb?
[

 

[jane s chickens]

Yes,it's a peacomb.

 

[nicalandia]

Would this be a peacomb?
View attachment 1414334 View attachment 1414335 [

Yes... the odds are on your favor...