Neo-Darwinians breathed a sigh of relief when in the 1930s they found a way to incorporate Mendel’s laws of heredity. Now, that relief is unraveling.
The authors offer a selectionist explanation, which is nevertheless uncertain. Note the repeated use of the subjunctive.
This is by no means an all-or-nothing selection (as the impression is sometimes given). Rather, the alleles are retained.
Scientific data are followed by the myth: “Finch beak morphology observed on the Galápagos Islands was used by Darwin to formulate his theory of evolution.”
How could the authors suddenly do this? Some of the following points may be considered.