Barring gene

[tazcat70]

Ok please tell me if I understand this correctly.

1. Barred rooster + unbarred hen = not a sex link
2. Barred hens + unbarred roo = Barred roo chicks unbarred pullets


If you do the barred roos, what % will be barred?

Thanks,

 

[Sonoran Silkies]

Barred roo X unbarred hen = 50% barred; 50% not.


All barred birds, regardless of gender will only have one copy of the barring gene and will not be sexable based on barring colour.

 

[KellyHM]

Quote:
Barred hen + unbarred roo DOES = barred roo chicks & unbarred pullet chicks...therefore they ARE sexlinked!

 

[Sonoran Silkies]

Hey Kelly, read the question again.

Tazcat wanted to verify that BARRED ROOS and NON-BARRED HENS do not create a sex-link, (which they do not) and that barred hens and non-barred roos give barred cockerels and non-barred pullets (which is also correct).

 

[KellyHM]

Quote:
Ok, I was just verifying the sex-linked part...guess I skipped over the other part.

 

[tazcat70]

Thanks!!!

 

[Henk69]

If the rooster is purebreed for barring B/B then all chicks will be barred. Else 50%

 

[TimG]

Quote:
Why do all males only have one barring gene? Isn't it only the female that is hemizygous for barring?

 

[Krys109uk]

Why do all males only have one barring gene? Isn't it only the female that is hemizygous for barring?

Usually a purebred barred male might be expected to be carrying two barring genes. So if he is crossed with a non barred hen then all of his offspring, whichever gender, would inherit one barring gene from him. From the mother the male offspring would also inherit & non barred gene on their Z chromosome & the female offspring would inherit a w.

 

[TimG]

Quote:
Usually a purebred barred male might be expected to be carrying two barring genes. So if he is crossed with a non barred hen then all of his offspring, whichever gender, would inherit one barring gene from him. From the mother the male offspring would also inherit & non barred gene on their Z chromosome & the female offspring would inherit a w.

A female is either B- (barred) or b- (not barred).

A male may be BB (barred), Bb (barred), bB (barred) or bb (not barred).

A male that is BB when mated with a female that is b- will produce 100% barred offspring; males will be Bb and females B-.

A male that is Bb (or bB) when mated with a female that is b- will produce 50% barred offspring and 50% non-barred offspring; males will be either Bb or bb and females will be either B- or b- all with equal likelihood.