Linked Life Data

12647534

Source:http://linkedlifedata.com/resource/pubmed/id/12647534

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2003-3-21
pubmed:abstractText
Based on the theory of organization and evolution of colonies in an extinct group of hemichordates graptolites (Urbanek, 1960, 1973) the relationship between the events in the late astogeny of bryozoan colonies and their somatic and reproductive cycle. The bryozoan colonies with simple organization are compared with graptoloid colonies and their structure is interpreted within the framework of the morphogen gradient theory. A morphogen produced by the founder-zooid (oozooid) diffuses along the long axis of the colonies and regulates the phenotypic expression of the size and structure of zooids. Evolutionary changes in the graptoloid colonies involve introduction of new characters and their spreading is also accompanied by gradient changes of their manifestation. Evolutionary mechanisms in bryozoan colonies are considered in terms of penetrance and expressivity of genes. In contrast to graptolites, many bryozoan colonies display multiple zones of astogeny changes and repetitions.
pubmed:language
rus
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
1026-3470
pubmed:author
pubmed:issnType
Print
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5-13
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:articleTitle
[Organization and evolution of animal colonies].
pubmed:affiliation
Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, Warszawa, 00-818 Poland. urbanek@twarda.pan.pl
pubmed:publicationType
Journal Article, English Abstract, Review