Study of how changes in biological development contribute to evolution. Comparative gene expression, developmental perturbations and phylogenetics can connect inherited mechanisms to new forms.
Evolutionary change in the amount or level of a developmental process, structure or expression pattern. A quantitative difference still requires a causal molecular and developmental explanation.
The classical avian hypothesis that anatomical digit identities I, II and III are expressed at positional condensations II, III and IV. It distinguishes position from developmental identity; evidence for a limited anterior shift does not require invariant identities for every posterior anatomical digit.[ref]
A specific historical hypothesis in which ectopic ovules arose on a predominantly male precursor during flower evolution. It combines gene-history and morphological arguments but remains distinct from a demonstrated ancestral developmental sequence.[ref]
The mostly male theory of flower evolutionary origins: from genes to fossils by Michael W. Frohlich and David S. Parker. Historical proposal and evidence considered
A proposed origin of a bisexual reproductive structure through regional modification of a formerly male structure. In one developmental scenario, restriction of B-class activity permits female identity in part of a C-active reproductive axis. Accessibility in a model system does not establish the historical precursor.
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