The following is an excerpt from Extended Heredity: A New Understanding of Inheritance and Evolution by Russell Bonduriansky and Troy Day.
The idea that genes encode all the heritable features of living things has been a fundamental tenet of genetics and evolutionary biology for many years, but this assumption has always coexisted uncomfortably with the messy findings of empirical research. The complications have multiplied exponentially in recent years under the weight of new discoveries.
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