"The Without and Within of Smart Mice", p. 234 (originally appeared in Time, 1999-09-13)
I Have Landed (2002)
“But here I stop—short of any deterministic speculation that attributes specific behaviors to the possession of specific altruist or opportunist genes. Our genetic makeup permits a wide range of behaviors—from Ebenezer Scrooge before to Ebenezer Scrooge after. I do not believe that the miser hoards through opportunist genes or that the philanthropist gives because nature endowed him with more than the normal complement of altruist genes. Upbringing, culture, class, status, and all the intangibles that we call “free will,” determine how we restrict our behaviors from the wide spectrum—extreme altruism to extreme selfishness—that our genes permit.”
"So Cleverly Kind an Animal", p. 266
Ever Since Darwin (1977)
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Stephen Jay Gould 274
American evolutionary biologist 1941–2002Related quotes

In Search of Memory (2006)
Context: Even though I had long been taught that the genes of the brain are the governors of behavior, the absolute masters of our fate, our work showed that, in the brain as in bacteria, genes are also servants of the environment.... An environmental stimulus... activates modulatory interneurons that release serotonin. The serotonin acts on the sensory neuron to increase cyclic AMP and to cause protein kinase A and MAP kinase to move to the nucleus and activate CREB. The activation of CREB, in turn, leads to the expression of genes that changes the function and the structure of the cell.
"Our Natural Place", p. 243
Hen's Teeth and Horse's Toes (1983)
"Biological Potentiality vs. Biological Determinism", p. 251
Ever Since Darwin (1977)

“Taking faith seriously leads to the utility of altruistic behavior.”
Source: Doing Virtuous Business (Thomas Nelson, 2011), p. 102.
“I have all these great genes, but they're recessive. That's the problem here.”
20 Jun 90
Attack of the Deranged Mutant Killer Monster Snow Goons
Source: The Complete Calvin and Hobbes