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Hi! That's interesting. I've never heard of NNxNN chicks not having naked necks. Is it possible that a non-naked neck bird was involved?
If they don't show a naked neck to some degree, they didn't inherit the gene for naked neck. They don't have it and can't pass it to their offspring. They can't carry it (recessively) because Na is a dominant gene (I said that wrong, somebody say it more clearly).
Pretty, pretty, pretty, Marco!
Lisa
If Na is a dominant gene, does that not mean the Na trait is shown in all offspring? Maybe there was a milkman-rooster involved there somewhere?
Dominant basically means "shows up in a cross". Naked neck x not naked neck will always throw some naked neck chicks.
The difference in % of chicks coming out with naked necks depends on if the naked neck parent(s) being pure or not pure for the NN gene. For example:
Pure NN x Buff Orp= 100% naked necked chicks.
Not pure NN x Buff orp+ 50% naked necked chicks.
Not pure NN x not pure NN= 75% naked necked chicks. (with some being pure NN and most not)
Non-naked chick is proof a NN parent(s) are not pure for it. Also non- NN chicks do not have the gene at all, even if both of their parents were NN..
Jersey, that's probably a coincidence. Proper ratios will show up in larger numbers.. it can seem way skewed in small numbers, same as to how humans are supposed to throw 50% boys 50% girls, but many families either have all or almost all of one sex or the other.