“As was demonstrated as long ago as the 1930s by the German experimental geneticist Hans Grüneberg, neither structural reduction or loss, nor structural addition, is a completely gradual process. Instead, the loss or gain of a structure is developmentally constrained to be more step-wise, or saltational.”

p, 125
Sudden Origins: Fossils, Genes, and the Emergence of Species (1999)

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Jeffrey H. Schwartz 25
American anthropologist 1948

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