What mix and gender is my chick?

[LuciferRoo]

If a barred rooster always passes on the barring, how did I get my black hen?
There were 3 hens and 1 rooster in my flock and yet I got a black hen out of the mating.

Apparently, a barred rooster with a single barred gene can produce a none barred offspring. That would solve my question above.
It may also be a clue as to how your girl got labeled as barred rock. Their rooster, like mine, is not a pure barred rock.

 

[NatJ]

If a barred rooster always passes on the barring, how did I get my black hen?
There were 3 hens and 1 rooster in my flock and yet I got a black hen out of the mating.

The barred rooster can give barring to his sons and to his daughters.
Whether he gives it to all of them, or just to some of them, depends on how many barring genes he has. A pure Barred Rock has two genes for barring, and gives one to every chick he sires. A rooster that has one barred parent and one non-barred parent will have one barring gene and one gene for not-barring. He gives barring to some of his chicks, and no barring to the others. Roosters are sometimes called "double barred" and "single barred" as a way to state whether they have two barring genes or just one.

I see where you got confused:

Barring is sex linked.
Barred mom x non-barred dad = daughters not barred, sons single barred.
Barred Hens can only pass barring onto sons, not her daughters.
Barred Roosters can pass barring onto anybody.

That is making the point about what sexes can receive barring from which parent, but is not clear about which times the chicks must receive barring (sons of a barred hen, all chicks of a double-barred rooster) and which chicks have a chance to be barred or not (chicks of a single-barred rooster.)