Darwin’s cathedral

The legend-credulous express dismay when challenged to produce just one instance of a Darwin discovery that was taken over by experimental biologists. “How can you doubt what everyone knows?” goes the response. Darwin, after all, proved evolution! So they say in fulsome certainty, but what are we to make of his failure to make the discovery central to his theory? I mean the science of heredity. He lavished attention on domestication, conducting many plant and animal breeding experiments, because he believed that such induced changes were evolution in miniature.

The lead chapter of the Origin argues this case. But, in a singular demonstration of the limits of even great minds, he didn’t notice that domestication evidence massively contradicted his theory. It disproved his key premise that continuous selection of a single trait would evolve a population of better adapted organisms. Domestication shows on the contrary that selection for a single trait results in changes in numerous traits - changes that are usually maladaptive.

Domestication also provided abundant documentation of events that Darwin stoutly declared cannot happen: single generation “leaps”, such as the two-headed calf and other “sports of nature”, that disprove his “gradualist” theory of organic change. The correct conception of inheritance was published in 1866 by Gregor Mendel. His carefully controlled experiments on hybrid garden peas (Pisum savtivum) enabled him to formulate the laws of segregation and independent assortment, which explain why the variations of pea traits (round and wrinkled, yellow and green) occurred in the ratios that he experimentally observed.

These trait variations are “leaps” that Darwin’s theory denies. It was the beginning of genetics and the first discovery of a quantitative biological law. Mendel believed that his discovery disproved Darwin’s theory. He was right.

Mendel’s publication enjoyed none of the braggadocio of “revolutionary” enlightenment. Indeed, it had no uptake whatever during his time. Yet eventually biologists rediscovered his work and embarked on a course leading to the discovery of chromosomes, genes, alleles, and sexual replication. It is a lesson worth repeating that Darwinians of the day recoiled in horror from these splendid discoveries. They proudly declared their “faith” in the master while hurling themselves vehemently at the new science. One, the brilliant Karl Pearson, persisted in dogged opposition to genetics until his death in 1936! So much for evidence.

The Darwin Exhibition doesn’t mention Mendel and Pasteur. Bringing them into the picture would spoil the halo over Darwin’s head and cast doubt on his singularity. Nor does it mention that the introduction of genetics, today considered the experimental core of any possible evolutionary theory, was accomplished over the bodies of true Darwinians. This silence about fundamental history of science underscores the regrettable faith-based orientation of the Darwin bicentenary, together with the implication that science is based on authority.

Creationists, alas, will probably conclude that the exhibition’s symphony to the legend confirms their conviction that to refute evolution one need but refute Darwin. This nonsense may be cast out by discarding the legend, which in any case has no business in science.