Individual vs group

When the Strong Outbreed the Weak: An Interview with William Muir
“Muir’s experiments reveal a tremendous naiveté in the idea that creating a good society is merely a matter of selecting the “best” individuals. A good society requires members working together to create what cannot be produced alone, or at least to refrain from exploiting each other.  Human societies approach this ideal to varying degrees, but there is always an element of unfairness that results in some profiting at the expense of others. If these individuals are allowed to breed, and if their profiteering ways are heritable, then selecting the “best” individuals will cause a cooperative society to collapse. It’s a good thing that the early eugenicists did not have their way!

Muir’s experiments also challenge what it means for a trait to be regarded as an individual trait.  If by “individual trait” we mean a trait that can be measured in an individual, then egg productivity in hens qualifies. You just count the number of eggs that emerge from the hind end of a hen. If by “individual trait” we mean the process that resulted in the trait, then egg productivity in hens does not qualify. Instead, it is a social trait that depends not only on the properties of the individual hen but also on the properties of the hen’s social environment.”