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With your cross you just made it is about there being one or not because you're making sex links. Your hens pass the gene to their sons only. The rooster doesn't have the barring gene so he passes it to neither sex. With your pure hens you would be dealing with autosexing. Both parents have the...

Then any with a head spot is male and any without is female.

Is the rooster barred/cuckoo? If not any with head spots are male. The one without is female. If he is barred I'd have to assume he is single factor barred since you have one chick without head spot. If that's the case any without head spot is female. Any with head spots would be a toss up.