Egg Color Genetics

[Cimmaron]

Am I correct that the blue gene is dominant? So a white egg layer crossed with a blue egg layer should make a blue egg layer? Would there be any way to tell the heterozygous blue egg from a homozygous one?

I have one cross breed pullet and I need to identify her egg or sell her before I start hatching from my purebreds!

 

[Brahma Chicken5000]

The blue egg gene O, is dominant to the non blue egg gene (white) O.

 

[FlomatonsFlocks]

So a white leghorn roo over an ameraucana should produce blue eggs? Will they be larger?

 

[nicalandia]

Am I correct that the blue gene is dominant? So a white egg layer crossed with a blue egg layer should make a blue egg layer? Would there be any way to tell the heterozygous blue egg from a homozygous one?

I have one cross breed pullet and I need to identify her egg or sell her before I start hatching from my purebreds!

Its an incompletely dominant autosomal mutation, that means that O/o+ hens will lay a faded tone of blue as oposed to O/O hens

 

[nicalandia]

So a white leghorn roo over an ameraucana should produce blue eggs? Will they be larger?

Not only larger, but should be more productive than regular Ameraucana, should be laying close to the pure leghorn egg production

 

[The Moonshiner]

Its an incompletely dominant autosomal mutation, that means that O/o+ hens will lay a faded tone of blue as oposed to O/O hens

Not gonna say that isn't true but it isn't so easy to see.
If you only have one hen laying what would you compare to to know if it's lighter or darker?
Different hens can also lay different shades of blue so how would you know if a lighter egg comes from a O/o+ hen that would lay a darker shade if O/O or if it's a O/O hen that just lays a lighter shade of blue.
Also blue eggs can change shade a bit if a hen is in a heavy laying cycle compared to when they're laying sporadically.
If you throw 6 O/o+ hens with 6 O/O hens you may be able to pick out a few correctly but I don't believe you can tell for certain which are which.