
What makes a Lab black?
A black Lab has at least one black copy of each of the two genes behind Lab color. One gene decides whether black pigment can form in the coat at all, and the other decides whether that pigment stays black or turns brown. Black wins out in both, so one black copy of each is enough for a black coat.
That leaves room for a black Lab to hide the other version of either gene. One black Lab may carry nothing else, another may carry yellow, another chocolate, and another both, and every one of them looks black. A DNA test of the parents tells them apart.











