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putative cause for the broad changes seen in domestication syndrome is pleiotropy. Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits. Certain physiological changes characterize domestic animals of many species. These changes include extensive white markings (particularly on the head), floppy ears, and curly tails. These arise even when tameness is the only trait under selective pressure. The genes involved in tameness are largely

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