Scientists Have Long Been Interested in Differences Between Dogs and Wolves

Scientists have long been interested in differences between dogs and wolves in their social behavior toward humans. Dogs and wolves share a common ancestor. In trying to understand the differences, a researcher analyzed data collected from 18 domesticated dogs and 10 wolves that had been raised by humans. If she discovered that the degree of social relationship a dog exhibited toward humans was positively correlated with a chemical modification of a part of a chromosome rather than what alleles a dog had, this would be an example of ________.

A) pleiotropy
B) incomplete dominance
C) epigenetics
D) polygenic inheritance

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