Brain Evolution: Developmental Constraints and Relative Developmental Growth
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Internal and external constraints in the evolution of morphological allometries in a butterfly.
Much diversity in animal morphology results from variation in the relative size of morphological traits. The scaling relationships, or allometries, that describe relative trait size can vary greatly in both intercept and slope among species or other animal groups. Yet within such groups, individuals typically exhibit low variation in relative trait size. This pattern of high intra- and low inte...
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Phenotypic traits are products of two processes: evolution and development. But how do these processes combine to produce integrated phenotypes? Comparative studies identify consistent patterns of covariation, or allometries, between brain and body size, and between brain components, indicating the presence of significant constraints limiting independent evolution of separate parts. These const...
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The more we discover about the basic structure of vertebrate and invertebrate evolution, the more impressive the evidence of its conservative nature becomes. Evidence for commonalities versus special adaptations in brain evolution, with particular attention to rules for the proliferation of the cortex will be discussed. Conserved developmental rules that produce highly predictable brain organiz...
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