Pea comb dominance

[CynthiaM]

Americauna rooster breeding with a brown hen. Resulting cockerals that are 7 weeks old with single combs. Thought the pea comb was dominant, what has happened?

 

[speckledhen]

Could be your rooster isn't pure for pea comb. Are you 100% positive that he is the sire?

 

[CynthiaM]

Pretty sure he is the pappa. This roo is in with Americaunas and brown hens. Got the eggs from a girlfriend, all eggs were blue. I would imagine he carries the blue gene, so any blue egg would be of his progeny. Hope I got this right.

 

[danielbrown]

Because all the eggs were blue does not mean much.
Coming from a blue egg does not mean he carries the blue egg gene.
He could have two copies of the blue egg gene, just one copy, or no blue egg gene. Blue egg genes are not sex-linked either.
same with pea comb he could be carrying genes for single comb and showing a pea comb.

What exactly are these "brown hens"?
Could you post pics of the birds? It would really help us answer your questions.

 

[CynthiaM]

Daniel, you asked for pictures, do you mean the parents or the chicks?

Revamped my information.

This rooster was purchased from our local co-op as a cockeral of three days old. Ameraucana.

This rooster is co-habiting with barred rocks, an Isa brown, silver laced Wyandottes and Ameraucana hens (which were purchased as chicks from the co-op as well).

Not all eggs were blue, some were brown, as was indicated in the original post topic here.

It appears that the barred rock looking cockerals and some of the brown looking cockerals all have single combs. Perhaps the Ameraucana rooster does have a single comb gene, but he shows the pea comb. Hope this clarifies.

 

[danielbrown]

Pics of the Ameraucana parents would really help.

Quote:
That could really explain why you are getting lots of single combs.
co-ops usually get their chicks from hatcheries. The hatchery "Ameraucana" are not really Ameraucana. They are mixed breeds that will likely lay colored eggs. We call them Easter Eggers. EE are a mixed bag when it comes to genetics. You just don't know what genes they are hiding under what they are showing.

 

[Sonoran Silkies]

Pea comb is dominant to not-pea (single) comb; however every bird has two copies of the gene. If he has one copy of pea comb and one of not-pea comb, half his progeny will inherit the not-pea gene. From a single combed parent they will always inherit a not-pea comb gene. And the birds with two copies of not-pea will not have pea combs. With one or two copies of pea comb, they will have a pea comb.

 

[CynthiaM]

My understanding is that the Brahma breed of chicken comes from the interbreeding of the Cochin and the Malay, long ago. Cochin have a single comb, well, my standard blues do anyways. My purebreed Light Brahma rooster (as well as other brahmas) would carry one copy of the pea comb, one copy of the single comb. Wonder if this understanding is correct, mysteries deepen. I would like elaboration on my statement please.

 

[Uppity Peon]

An animal (or plant) that shows a particular trait won't always "breed true" for that trait. That is because it carries 2 copies of that gene, one from the mother and one from the father.

When it carries two unlike copies of a gene, the type that is visible is more or less random. And the type that it passes down to its offspring is more or less random.

To breed true for a trait, both copies of the gene must be identical. So if you want 100% of your chicks to have a particular type of comb, you have to have parent chickens that not only have, but breed true for that type.

 

[Sonoran Silkies]

Quote:
On an initial cross, yes. But not after any generations.