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BIOL 370 – Developmental Biology Topic #22 Developmental Mechanisms of Evolutionary Change Lange Figure 19.9 Correlation between beak shape and the expression of Bmp4 in Darwin’s finches Figure 19.10 Correlation between beak length and the amount of calmodulin (CaM) gene expression in Darwin’s finches Figure 19.11 Role of BMP4 and calmodulin (CaM) in beak evolution in Darwin’s finches Allometry is the study of the relationship of body size to shape, anatomy , physiology and finally behaviour, first outlined by Otto Snell in 1892, D'Arcy Thompson in 1917 and Julian Huxley in 1932. Figure 19.12 Allometric growth in the whale head Figure 19.19 Extra cervical ribs are associated with childhood cancers Figure 19.23 Mice with mutations in the leptin genes are genetically obese End.