Orpington colours

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junebuggena said:
Check them over really well. To get a chocolate male, one of the hens must also have chocolate. It's a modifying gene for black patterning only. And hens can't carry it. Hens always express it. Jubilee are red with black and white flecks. One must have chocolate flecks instead of black.
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I'll look em over, thanks
 
Gray Farms said:
All but one were females. One chocolate mottled was male.
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The male has a genetic condition called monosomy. Monosomy is usually due to primary nondisjunction during meiosis. In order for the sex-linked chocolate gene to express itself, the male must only carry one choc gene on one Z chromosome and he is missing his second Z chromosome. It is possible that the male has one complete Z chromosome and a part of the matching Z chromosome. The chromosome could be missing an arm or a part of the arm that holds the choc gene. The chances are good that he will be infertile.
 
Wappoke said:
The male has a genetic condition called monosomy. Monosomy is usually due to primary nondisjunction during meiosis. In order for the sex-linked chocolate gene to express itself, the male must only carry one choc gene on one Z chromosome and he is missing his second Z chromosome. It is possible that the male has one complete Z chromosome and a part of the matching Z chromosome. The chromosome could be missing an arm or a part of the arm that holds the choc gene. The chances are good that he will be infertile.
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He's definitely infertile now, I butchered him a couple weeks ago with a bunch of other extra cockerels. Guess we'll never know. Boy this genetic stuff is complicated. My hats off to you guys that understand it, just reading this post makes my head hurt lol.
 

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