Breeder knowledge
The hidden half
Two dragons with similar colour and pattern may carry different recessive genes. When paired, one may produce visual morphs that the other never could.
The reverse is also true: visually different dragons can share important hidden genetics and produce overlapping results.
Evidence limit
Colour is even more complex
Selectively developed colour lines are unlikely to behave like one simple on-or-off gene. Multiple genes, parental combinations and environmental influences can all contribute to the final appearance.
This is why a breeder can estimate likely outcomes but cannot guarantee the exact colour, pattern or intensity of every hatchling.