Someone working with Black back gene?

[Felidae]

Thanks Deb! Nice baby.
Yep, cause of that I thought at the past year that the results are just random diversity, but now I know, it's genetic for sure. I have those "anomalies" two years in a row with several hatchlings. In the genetic Black back part I'm less confident, cause I never saw an example in person. The sire suspected as black back lesser, but I must be sure it's not the dame who carry the thing.