| Topic: |
Religions > Atheism |
| User: |
"maff" |
| Date: |
01 Jun 2005 04:21:25 AM |
| Object: |
Hox |
Decoding the Cambrian Radiation
http://www.americanscientist.org/template/BookReviewTypeDetail/assetid/42353;jsessionid=aaahXxCksrujFe
Derek E. G. Briggs
On the Origin of Phyla. James W. Valentine. xxiv + 614 pp. University
of Chicago Press, 2004. $55.
The recent surge in interest in the origins of multicellular animals
(metazoans) is fueled by new evidence from three major sources:
molecular sequencing, the study of evolutionary development and the
discovery of exceptionally preserved fossils of Precambrian and
Cambrian age, particularly from China. Genetic sequences provide a
means of analyzing how the major animal groups are related and of
estimating their time of origin (using the molecular clock)-a means
that is independent of morphological data and the record of
evolutionary events the fossils reveal. The study of developmental
processes in an evolutionary framework ("evo-devo") provides the link
between genetics and morphology. These new approaches have prompted
molecular biologists to join forces with paleontologists to focus on
the sequence of events leading to the origin of body plans before and
during the Cambrian Period (543 to 500 million years ago).
(Hox OR homeobox OR homeotic) Hox OR homeobox OR homeotic
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