منابع مشابه
Bird evolution
The evolution of birds is thought to have begun in the Jurassic Period, with the earliest birds derived from theropod dinosaurs. Birds are categorized as a biological class, Aves. The earliest known species of class Aves is Archaeopteryx lithographica, from the Late Jurassic period, though Archaepteryx is not commonly considered to have been a true bird. Modern phylogenies place birds in the di...
متن کاملBird evolution
other to achieve their goal. There are also heroes and heroines and Ashburner identifies these as including Gerry Rubin and Suzi Lewis in particular. Heroes come in all shapes and sizes and, despite what Scott Hawley says in his Epilogue, they most definitely include Michael Ashburner. The heroes of mythology were no less fallible than the rest of us and, characteristically and endearingly, Ash...
متن کاملRecurrent DCC gene losses during bird evolution
During development, midline crossing by axons brings into play highly conserved families of receptors and ligands. The interaction between the secreted ligand Netrin-1 and its receptor Deleted in Colorectal Carcinoma (DCC) is thought to control midline attraction of crossing axons. Here, we studied the evolution of this ligand/receptor couple in birds taking advantage of a wealth of newly seque...
متن کاملThe Evolution of Differential Bird Migration
of Baker's View of Avian Migration Baker (197S) defines migration to include any non-accidental movement by a metazoan from one spatial unit to another' He assumes It at migrations have evolved because they are, or historically have been' "J"piitat the level of individual selection' (As he puts it, chickens cross the road because they find conditions sufficiently better on the other side to hav...
متن کاملEvolution of bird genomes-a transposon's-eye view.
Birds, the most species-rich monophyletic group of land vertebrates, have been subject to some of the most intense sequencing efforts to date, making them an ideal case study for recent developments in genomics research. Here, we review how our understanding of bird genomes has changed with the recent sequencing of more than 75 species from all major avian taxa. We illuminate avian genome evolu...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2006
ISSN: 0960-9822
DOI: 10.1016/j.cub.2006.04.023