Black as a base-color inheritance example

Porter's reference represents the established Black color with two copies of the dominant black factor at the bronze locus. In that model, black is dominant to the bronze and black-winged-bronze alternatives. This explains why color inheritance needs a description of underlying factors as well as a photograph.

The variety's dark appearance does not by itself establish a particular Norfolk, Spanish or American strain history. A named strain and a color genotype answer different questions: one concerns the stock's breeding background, the other concerns an inherited pigmentation model. Standard adult weights are also ideals rather than a measured size for every present flock. Teaching those distinctions helps prevent a visually simple color from becoming an oversimplified conservation account.