Despite the unknowns in the identity and action of the cr-associated gene in generating the crest, one thing is certain about it: it is a "gene of large effect." Such genes were written out of the mid-20th-century Darwinian synthesis.
There's a pigeon flying overhead when Eugene and Kaori Oda open the front door. And another. And another. Three in all. They land in the living room, where they're sitting in a row on the sofa, which is protected by a pair of plastic tablecloths.