...if there is a unknown and Undocumented gene darkening the wildtype chick down on this birds, seems recessive in nature and needs to be cull on site,
Punnett lived in an era that didn't have gene mapping, but the level of organization and documentation of their research is some of the best out there.
One of their research projects was on the Legbar down color. No name was given to the gene that causes the light and dark down color, but my theory is that is could be similar the gene that gives the light and dark down color in the Jearhon Breed. Those genetics are also unknown too, but two distinct varieties are based on that unknown gene.
If my memory serves me well only about 3% of the chicken genome has been mapped. That leaves around 97% that is unknown and undocumented. Only the major genes have names (are know). Punnett's research proved the dark down type to be dominant. The Light down type like seen in Babymake6's photos of her scissor beaked cockerel is recessive.
I see no need to cull for dark down type. It has been part of the breed for over 80 years. I have kept a photo progression of the light and dark down type in my original stock. I completed the comparison this summer and would gladly send the file to anyone that provides me an email address (sorry can't send aPDF attachment through PM's on the BYC. I need an email address).
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