So there's genes for the short tail in the band-tailed pigeon, genes for the long tail in the passenger pigeon, and so on with the red eye, peach-colored breast, flocking, and so on.
Postoje geni za kratak rep kod goluba trakastog repa, geni za dug rep kod goluba selca, isto tako s crvenim očima,  prsima boje breskve, formacije jata, itd.