Sociobiology
Fuchsia
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Taken from the silver fox experiment wikipedia page: https://www.wikiwand.com/en/Domesticated_silver_fox .
"After over 40 generations of breeding, in short, Belyayev produced "a group of friendly, domesticated foxes who 'displayed behavioral, physiological, and anatomical characteristics that were not found in the wild population, or were found in wild foxes but with much lower frequency….Many of the domesticated foxes had floppy ears, short or curly tails, extended reproductive seasons, changes in fur coloration, and changes in the shape of their skulls, jaws, and teeth. They also lost their 'musky fox smell'." It was Belyayev's view that these new attributes, which were extremely similar to the attributes of other domesticated animals, "was the result of selection for amenability to domestication." His reasoning was that behavior is "regulated by a fine balance between neurotransmitters and hormones at the level of the whole organism ... . Because mammals from widely different taxonomic groups share similar regulatory mechanisms for hormones and neurochemistry, it is reasonable to believe that selecting them for similar behavior – tameness – should alter those mechanisms, and the developmental pathways they govern, in similar ways."
TL;DR - Selective breeding in foxes was able to produce the psychologic trait of tameness and that genes corresponding to psychological traits also affect physical characteristics when altered.
"After over 40 generations of breeding, in short, Belyayev produced "a group of friendly, domesticated foxes who 'displayed behavioral, physiological, and anatomical characteristics that were not found in the wild population, or were found in wild foxes but with much lower frequency….Many of the domesticated foxes had floppy ears, short or curly tails, extended reproductive seasons, changes in fur coloration, and changes in the shape of their skulls, jaws, and teeth. They also lost their 'musky fox smell'." It was Belyayev's view that these new attributes, which were extremely similar to the attributes of other domesticated animals, "was the result of selection for amenability to domestication." His reasoning was that behavior is "regulated by a fine balance between neurotransmitters and hormones at the level of the whole organism ... . Because mammals from widely different taxonomic groups share similar regulatory mechanisms for hormones and neurochemistry, it is reasonable to believe that selecting them for similar behavior – tameness – should alter those mechanisms, and the developmental pathways they govern, in similar ways."
TL;DR - Selective breeding in foxes was able to produce the psychologic trait of tameness and that genes corresponding to psychological traits also affect physical characteristics when altered.
