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Definition
| Evolutionary mechanism in which the relative growth rates of different modules changes with respect to each other. |
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Definition
| Situation in which evolutionary changes in one module of an embryo affect development in another module. |
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Definition
| A molecular homology found in two groups of organisms which diverged from a common ancestor that existed in the distant past. |
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| Developmental constraints |
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Definition
| Physical, morphogenetic, and phyletic restraints that limit the number of body plans that can be created by evolution. |
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Definition
| Situation in which changes in development in one module do not affect development of other modules. |
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Term
| Duplication and divergence |
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Definition
| Mechanism of evolutionary change whereby modules are copied, followed by differentiation and specialization among the redundant structures. |
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Definition
| Heritable variants in chromatin structure and gene expression states that are not based on variation in DNA sequences. |
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Definition
| Process by which an initially environmentally induced phenotype through selection becomes fixed in a population so that the phenotype develops even in the absence of environmental induction. |
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| Epigenetic inheritance systems |
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Definition
| Processes by which phenotypic variation not associated with DNA sequence variation is inherited. |
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Term
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Definition
| Evolutionary mechanism in which the relative timing of development in different modules of a developing system change with respect to each other. |
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Term
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Definition
| Evolutionary change in the amount of a structure or level of gene expression. |
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Definition
| Expression of an existing structure or function in a different part of the body. |
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Definition
| Evolutionary production of a new kind of gene or structure. |
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Term
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Definition
| Development through a series of discrete and interacting parts. |
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Term
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Definition
| Existence and use throughout the animal kingdom of a relatively small set of regulatory genes that are used to build animal body plans. |
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Term
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Definition
| Related genes in different species that are descended from the same gene in a common ancestor. |
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Term
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Definition
| Related genes that are derived from gene duplication within a single genome. |
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