American Scientist Online - Have We Solved Darwin's Dilemma?

American Scientist Online - Have We Solved Darwin's Dilemma?:

"The Modern Synthesis itself built on Darwin's two major realizations: first, that all living organisms are related to one another by common descent; second, that a primary explanation for the pattern of diversity of life—and especially for the obvious 'fit' of organisms to their environments—is the process that he called natural selection. It took about seven decades for biologists to add the next round of important building blocks to the Darwinian view of life. Modern Synthesists such as Theodosius Dobzhansky, Ernst Mayr, George Gaylord Simpson and G. Ledyard Stebbins reconciled disparate fields of biology, from population genetics to paleontology, by expanding the array of evolutionary processes to include migration, mutations, assortative (nonrandom) mating and (random) genetic drift."