10. The Genetics of Dog Domestication
Genetic analysis shows that domestic dogs differ from their wild counterparts in several key areas, particularly genes associated with starch digestion and social behavior. The AMY2B gene, for example, is far more abundant in dogs than in wolves, which suggests an adaptation to a starch-rich diet consistent with proximity to human settlements. Recent DNA research has enabled scientists to compare modern dog genomes with ancient canine DNA extracted from archaeological specimens.
The studies indicate that domestication may have occurred independently in different geographic regions, followed by admixture between the different lineages. 11,000 years ago, there were at least five distinct dog lineages around the world, that have since merged. Domestication’s genomic signatures are complex and varied. Unlike other animals that show clear bottlenecks and intense selection markers, dogs display a patchwork of evolutionary changes that indicate a prolonged and multifaceted process.
