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In the Darwinian struggle of scientific ideas, the gene is surely among the select. It has become the foundation of medicine and the basis of vigorous biotechnology and pharmaceutical industries. Media coverage of recent studies touts genes for crime, obesity, intelligence—even the love of bacon. We treat our genes as our identity. Order a home genetic-testing kit from the company 23andMe, and the box arrives proclaiming, “Welcome to you.” Cheerleaders for crispr, the new, revolutionarily simple method of editing genes, foretell designer babies, the end of disease, and perhaps even the transformation of humanity into a new and better species. When we control the gene, its champions promise, we will be the masters of our own destiny.

The gene has now found a fittingly high-profile chronicler in Siddhartha Mukherjee, the oncologist-author of the Pulitzer Prize–winning The Emperor of All Maladies, a history of cancer. The Gene’s dominant traits are historical breadth, clinical compassion, and Mukherjee’s characteristic graceful style. He calls it “an intimate history” because he shares with us his own dawning awareness of heredity and...