کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4499020 1319010 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Inferring developmental constraint and constraint release: Primordial germ cell determination mechanisms as examples
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Inferring developmental constraint and constraint release: Primordial germ cell determination mechanisms as examples
چکیده انگلیسی
Developmental constraint and its converse constraint release are significant concepts in understanding pattern and process in macroevolution. The purpose of this paper is to propose a two-step method for identifying constraints and constraint release. The first step is a phylogenetic optimization procedure to identify which trait/process is primitive and which is derived. The primitive trait is inferred to be the constraint and the convergently derived trait the release. The second criterion uses sister-clade asymmetry. Clades diagnosed by the constraint will have fewer taxa than clades diagnosed by the release. As an example, we use the process of germ cell specification, in which there are three modes of specification. Our results corroborate previous conclusions that the induced mode is the constraint and the predetermined mode is the release and we speculate on the importance of these two processes in terms of robustness and evolvability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Theoretical Biology - Volume 248, Issue 2, 21 September 2007, Pages 322-330
نویسندگان
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