Barred Rocks cockerels or pullets?

[Sas117]

I bought these barred rock chicks at a local auction and don't know anything about where they came from. I am hoping they are not male SL barred rocks. One is a roo for sure and he has a more defined striped pattern. I think they are a little over 3 weeks old.
#1 roo

#2


#3

#4

#5

#6


Does anyone have any ideas?

 

[TheOddOneOut]

Too young, but I agree the first is probably make

 

[McChooky]

This one was supposed to be a Dominique pullet but I'm guessing its a barred rock with that comb. Its darker than all my other Doms by far depending on the light.The only 2 with red combs are this one and one thats got a rose comb that looks like a roo.With Hatchery stock its hard to determine what you have...

 

[Silviaschicks]

Yep that’s a barred rock

 

[Sas117]

My Chicks are now five weeks old and are not showing any signs of being roosters except that one at the top. He looks different from the others, his stripes are more even and his comb is getting bigger and redder. Fingers crossed I have one roo and five pullets.

 

[Silviaschicks]

Another way to tell is males have more white because they only have one copy of the barring gene whereas hens have two

 

[Painted Calls]

Another way to tell is males have more white because they only have one copy of the barring gene whereas hens have two

Males have more white because they have 2 copies of the barring gene. The females only have one, making them darker.

 

[EmmaRainboe]

Another way to tell is males have more white because they only have one copy of the barring gene whereas hens have two

Males are lighter due to carrying two copies of the barring gene. Barring is carried on the Z sex chromosome so because males have two Z chromozomes they can carry 0-2 barring genes. Female have one Z chromosome, so can pnly carry 0-1. The barring gene is a restrictor gene. It restricts eumelanin (black pigment) to stripes.

It restricts the pigment depositing on and off while the feathers grows. Having too copies of the barring gene restricts the eumelanin for longer, creating wider white bars, leading males to appear lighter.

It is not like humans where the male determines the sex of the offspring. In chickens, the females do.

human males: XY
human females: XX

but in chickens,

hens: ZW
roosters: ZZ

 

[Painted Calls]

Males are lighter due to carrying two copies of the barring gene. Barring is carried on the Z sex chromosome so because males have two Z chromozomes they can carry 0-2 barring genes. Female have one Z chromosome, so can pnly carry 0-1. The barring gene is a restrictor gene. It restricts eumelanin (black pigment) to stripes.

It restricts the pigment depositing on and off while the feathers grows. Having too copies of the barring gene restricts the eumelanin for longer, creating wider white bars, leading males to appear lighter.

It is not like humans where the male determines the sex of the offspring. In chickens, the females do.

human males: XY
human females: XX

but in chickens,

hens: ZW
roosters: ZZ

You didn't need to out-nerd me, Emma.

 

[The Moonshiner]

You didn't need to out-nerd me, Emma.

She must be studying harder.
@EmmaRainboe