Title: Limited coverage
Product review: I was expecting a review of speciation, particularly the type as seen in the fossil record which shows the origin of evolutionary novelties. However, the only speciation recognized in this book is variation that affects reproduction. A few mutations in a few genes increase variation within a species, and sometimes that variation affects reproduction.Recent studies have shown that speciation which introduces evolutionary novelties requires many changes to many genes, totalling some thousands of changes, but that was not mentioned. The section on macroevolution discussed the persistence of species, on the order of 1 to several million years, but they failed to comment on the implications of millions of years with no changes, followed in a very short time with a new species in the fossil record, fully changed with thousands of base changes. No source for those thousands of changes is mentioned.
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