When humans began to tame dogs and sheep and cattle, they may have continued a tradition that started with a completely different animal: us. ScienceMagArchives
, a disorder linked to cognitive impairments, smaller skulls, elfinlike facial features, and extreme friendliness.plays a role in those facial features, Testa and colleagues cultured 11 neural crest stem cell lines: four from people with Williams-Beuren syndrome, three from people with a different but related disorder in which they have duplicates instead of deletions of the disorder's key genes, and four from people without either disorder.
William Tecumseh Fitch III, an evolutionary biologist and cognitive scientist at the University of Vienna, says he is skeptical of"precise parallels" between human self-domestication and animal domestication."These are processes with both similarities and differences," he says."I also don't think mutations in one or a few genes will ever make a good model for the many, many genes involved in domestication.
As for why humans might have become domesticated in the first place, hypotheses abound. Wrangham favors the idea that as early people formed cooperative societies, evolutionary pressures favored mates whose features were less"alpha," or aggressive."There was active selection, for the very first time, against the bullies and the genes that favored their aggression," he adds. But so far,"Humans are the only species that have managed this.
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