Not necessarily true. Color depends on the bloodline and locale. I have produced animals that are nearly 95% yellow as adults, and I've seen animals that are 99.9% yellow. There are more and more color variations of chondros popping up every season........black, calico, blue, yellow, albino. There out there and it's only a matter of time before you see them.
Three sisters from a 2006 clutch.
Sibling from the same clutch.
Chondros genetics are still not fully understood. The animals above were produced from a pair of very plain adults. When locales are crossed, there is always the possibility of producing something unique.....the element of chondro surprise.