Mosaic development
The mosaic development is a developmental pattern of the embryonic development . It leads the genetic or cytoplasmic determinants in the egg to an early assignment of tasks and forces the cells to follow a deterministic path of development, wholly or slightly dependent on others. A specific part of the embryo emerges from each of the early blastomeres . In some animals the fate of the blastomeres is already determined in the zygote . Mosaic development occurs in a pronounced form in the nematode Caenorhabditis elegans , but also in mollusks . The constant number of cells in the adult individual ( Eutelie ) of C. elegans makes it possible to trace an unambiguous cell pedigree from each individual cell with each specific cell division back to the zygote. The counter-model to the mosaic development is the regulatory development , in which, among other things, morphogens with the formation of concentration gradients of cell signal molecules play a greater role in morphogenesis , for example in vertebrate development.
Individual evidence
- ↑ Werner A. Müller, Monika Hassel: Developmental and reproductive biology of humans and animals. 3. completely revised Edition. Springer, 2003, ISBN 3-540-43644-8 .
- ^ Neil A. Campbell, Jane B. Reece: Biology. 6. revised Edition. Pearson Studium, Munich 2006, ISBN 3-8273-7180-5 .