East Asia, Karen Hopkins, Paul discussed on Scientific American Podcast: 60-Second Science - Why The Cross Put Chickens On A New Road


This is scientific americans 62nd science i'm karen hopkins all the why did the chicken cross the road not not so philosophical pickled but if you want to know why chickens don't get cross at people why they're content being kept in their coupes science can help optimistic species interesting because their genetic makeup has changed dramatically as paul the process of going for went to domestic lease allude and of lucien geneticists dan anthropologists at the university of oxford and cambridge and indeed who had people have compared wooden domestic any with their wild relatives they've identified genes that do show signs of strong reasons selection one such gene is thyroid stimulating horror receptors otherwise known as tsa r in chickens variant of this gene that is widespread in wooden nations has been shown to directly coast chickens to be less fearful of humans and also result in reduced to aggression towards collins specifics but what exactly did this election for these trades and therefore this variant take place it's been suggested because of the potential usefulness of these traits in domestic setting that selection of this gene must have happened when chickens where first domesticated around six thousand years ago in east asia but in an evolutionary time scale this is just a blink of an eye and we just don't know and don't have the resolution to tell when exactly between six thousand years ago and now this selection happened using data from nations but with dna from all article material we can follow what happened with a gene full time and in theory spokesman changes in a population a cure loop in her colleagues examined tsa george gene sequences in the ancient remains of about sixty chickens found in europe an estimated that selection it this tsa john okay this happened only around one thousand years ago at medieval times that is five thousand years after the initial domestication of chicken.

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