Color genetics thread.

[AmandaMBG]

What I've read in this is that Cuckoo is not as crisp and is blurrier than Barred. That is the difference between Barring and cuckoo.

So they are two different genes?

 

[Wappoke]

So they are two different genes?

Not two different genes but alleles at the same locus. There is no research data ( i have not seen any) that would support two different alleles at the barring locus that would produce crisp vs blurry barring. There is another allele at the barring locus called sex linked dilution, Two SD genes in males produces a white chicken and differs from dominant white because SD dilutes red also. Females and males that carry one SD are blue barred.

Cuckoo refers to the barring that is blurry and not exact.

Barring refers to birds that may not be crisp or it may be crisp.

Do a picture search and look at hatchery barred rocks and compare them to show quality birds. Hatchery barred rocks are usually cuckoo and show quality are not cuckoo. Show birds are barred and meet the standard of perfection for barring.

 

[AmandaMBG]

Okay

Not two different genes but alleles at the same locus. There is no research data ( i have not seen any) that would support two different alleles at the barring locus that would produce crisp vs blurry barring. There is another allele at the barring locus called sex linked dilution, Two SD genes in males produces a white chicken and differs from dominant white because SD dilutes red also. Females and males that carry one SD are blue barred.

Cuckoo refers to the barring that is blurry and not exact.

Barring refers to birds that may not be crisp or it may be crisp. 

 

[Chicken5555]

question...this cockerel is half Ameraucana and half cuckoo marans. I have no barred/cuckoo females.
Would all or half of his daughters have cuckoo markings?
Would his cuckoo daughter's sons be cuckoo? Thanks.

 

[junebuggena]

question...this cockerel is half Ameraucana and half cuckoo marans. I have no barred/cuckoo females.
Would all or half of his daughters have cuckoo markings?
Would his cuckoo daughter's sons be cuckoo? Thanks.

A single copy of the barring/cuckoo gene means that about 50% of his chicks, regardless of gender, will be barred/cuckoo.

 

[Chicken5555]

A single copy of the barring/cuckoo gene means that about 50% of his chicks, regardless of gender, will be barred/cuckoo.

So it's not sex linked then. ok. If I crossed his cuckoo daughter back to him, then 1/4 of the offspring will have 2 copies of the gene right? and 1/2 would be heterozygous and 1/4 would not be barred at all. And that's regardless of gender?

 

[Wappoke]

So it's not sex linked then. ok. If I crossed his cuckoo daughter back to him, then 1/4 of the offspring will have 2 copies of the gene right? and 1/2 would be heterozygous and 1/4 would not be barred at all. And that's regardless of gender?

barring is sex-linked. Some of the daughters will have barring and some will not.

this is the cross B b male x B female = F1` offspring BB males and Bb males (all males barred), B females barred b females nonbarred
b= normal gene for non-barring



Sex linked trait rules to remember (in chickens) The rules do not apply when dealing with trisomy in males.

Males can carry one or two genes for a sex-linked trait.

Females can only carry one gene for a sex-linked trait.

Female chickens only inherit one sex-linked gene (in this case one barring gene). The father contributes one sex-linked gene (for barring) to each daughter. Sex-linked traits in females are inherited from the father.

If a father carries only one sex-linked gene for a trait then some daughters will have the trait and some will not have the trait. If he carries two sex-linked genes for a trait every daughter will inherit one gene for the trait.

The mother does not contribute sex-linked genes or traits to her daughters.

Males (with a trait) will inherit one or two sex-linked genes from the parents. The father can contribute one gene for a sex-linked trait and the mother can give one sex-linked gene to each son.If a son only carries one sex-linked gene for a trait, he could have inherited it from the father or he could inherit it from the mother.

If a father carries only one sex-linked gene for a trait then some daughters will have the trait and some will not have the trait. If he carries two sex-linked traits every daughter will inherit one gene for the trait.

If you cross a non-barred female to a barred male ( two doses of the barring gene)= all the offspring will barred.

barred female x nonbarred male = barred males and nonbarred females.


The male in the picture has some strange barring in the hackles. I have seen zonal barring in males before but the barring in your bird is unusual. Are you sure he is barred- I have seen hackles similar to that in a few birds that were not barred. He should have some barring in the body and I do not see any.

 

[Chicken5555]

barring is sex-linked. Some of the daughters will have barring and some will not.

this is the cross B b male x B female = F1` offspring BB males and Bb males (all males barred), B females barred b females nonbarred
b= normal gene for non-barring



Sex linked trait rules to remember (in chickens) The rules do not apply when dealing with trisomy in males.

Males can carry one or two genes for a sex-linked trait.

Females can only carry one gene for a sex-linked trait.

Female chickens only inherit one sex-linked gene (in this case one barring gene). The father contributes one sex-linked gene (for barring) to each daughter. Sex-linked traits in females are inherited from the father.

If a father carries only one sex-linked gene for a trait then some daughters will have the trait and some will not have the trait. If he carries two sex-linked genes for a trait every daughter will inherit one gene for the trait.

The mother does not contribute sex-linked genes or traits to her daughters.

Males (with a trait) will inherit one or two sex-linked genes from the parents. The father can contribute one gene for a sex-linked trait and the mother can give one sex-linked gene to each son.If a son only carries one sex-linked gene for a trait, he could have inherited it from the father or he could inherit it from the mother.

If a father carries only one sex-linked gene for a trait then some daughters will have the trait and some will not have the trait. If he carries two sex-linked traits every daughter will inherit one gene for the trait.

If you cross a non-barred female to a barred male ( two doses of the barring gene)= all the offspring will barred.

barred female x nonbarred male = barred males and nonbarred females.


The male in the picture has some strange barring in the hackles. I have seen zonal barring in males before but the barring in your bird is unusual. Are you sure he is barred- I have seen hackles similar to that in a few birds that were not barred. He should have some barring in the body and I do not see any.

The person who bred the cockerel said that his mother is a cuckoo marans and his father is a splash Ameraucana. Here he is with his brothers. The splash on the left has very faded markings, but they are cuckoo/barred too. The boy between the two splashes is half sibling (mother is a black copper marans). If these guys' markings are not caused by a cuckoo/barred gene, then what would cause them to have the appearance of barring?

 

[junebuggena]

The person who bred the cockerel said that his mother is a cuckoo marans and his father is a splash Ameraucana. Here he is with his brothers. The splash on the left has very faded markings, but they are cuckoo/barred too. The boy between the two splashes is half sibling (mother is a black copper marans). If these guys' markings are not caused by a cuckoo/barred gene, then what would cause them to have the appearance of barring?

You missed the point. Barring is sexlinked, but it has to be the hen that has the barring to get sexlinks. Males can pass that barring to any gender offspring. It's the hens that can only pass it to their male offspring. All of those boys are black sexlinks. But since black sexlinks only have a single copy of the barring gene, only 50% of their offspring will get the barring, and it won't be gender specific.

If I crossed his cuckoo daughter back to him, then 1/4 of the offspring will have 2 copies of the gene right? and 1/2 would be heterozygous and 1/4 would not be barred at all. And that's regardless of gender?

His barred daughter, bred back to him, will produce some sexlinks. Since a barred hen can only pass that barring gene to her male offspring, that means that all of the boys will have barring. You can be certain that any chicks without barring are female. But you can't assume that all of the chicks with barring are male, since the rooster does have a copy of the barring gene. Some may be female. Any chicks that have two copies of the barring gene will be male, since only males can have two copies of the gene.

 

[Chicken5555]

Barring is sexlinked, but it has to be the hen that has the barring to get sexlinks. Males can pass that barring to any gender offspring. It's the hens that can only pass it to their male offspring. All of those boys are black sexlinks. But since black sexlinks only have a single copy of the barring gene, only 50% of their offspring will get the barring, and it won't be gender specific.

That does make sense. Sorry I got confused earlier.... I get distracted too easily.
So, breeding the barred daughters to any black/blue male would cause all the males to be barred. I wouldn't necessarily have to breed them back to their father to get barred roosters? And those chicks would be "black sexlinks"?

You said, "All of those boys are black sexlinks"
I never would have though of that since they are blue and splash, but blue and splash are black at the E locus. duh, LOL

wappoke's comment about their markings being unusual triggered another question though. How can they have barred markings and not have the barred gene?? I would think they look different than typical barring because they don't have a slow feathering gene to give them crisp tight stripes. Their mother is cuckoo, and cuckoo is barring without the slow feathering gene which makes the stripes wider and more blurred. Correct me if I'm wrong.