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The germ layer concept has been one of the foremost organizing principles in developmental biology, classification, systematics and evolution for 150 years. Of the three germ layers, the mesoderm is found in bilaterian animals but is absent in species in the phyla Cnidaria and Ctenophora, which has ...
ORGANISM(S): Caenorhabditis elegans 
The phenotype is an interplay between genetic and environmental components, however the relationship between these two is difficult to predict. For any particular environment only a handful of genes show gene environment interaction [refs]. This may imply that certain constrains prevent genes to par...
ORGANISM(S): Caenorhabditis elegans 
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