68 I The Process of Evolution 



standpoint of evolution. Many students of evolution, viewing the 

 process from the end of a diplophase, have tended to ignore this 

 fact of life. 



REFERENCES 



Cellular Regulatory Mechanisms. 1961. Cold Spring Harbor Symposia on 

 Quantitative Biology, vol. 26. See especially the articles by Jacob and 

 Monod. 



Darlington, C. D. 1958. The Evolution of Genetic Systems. 2d ed. Basic 

 Books, Inc., New York. The relationships between heredity and devel- 

 opment are boldly explored in this stimulating book. 



Waddington, C. H. 1957. The Strategy of the Genes. G. Allen, London. 

 The steps (epigenotype) between genotype and phenotype are dis- 

 cussed in one of the few synthetic works in the field. 



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