By Alessandro Minelli
Modern examine in evolutionary developmental biology has been predominantly dedicated to analyzing uncomplicated good points of animal structure in molecular genetics phrases. significantly much less time has been spent at the exploitation of the wealth of evidence and ideas from conventional disciplines, resembling comparative morphology. This ebook integrates conventional morphological and modern molecular genetic ways and bargains with postembryonic improvement to boot. It deals unconventional perspectives at the easy good points of animal association, reminiscent of physique axes, symmetry, segments, physique areas, appendages and similar suggestions. This e-book is of specific curiosity to graduate scholars and researchers in evolutionary and developmental biology, telephone biology, genetics, and zoology.
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Newman’s concept of segmentation is close to that of compartmentalisation (for a deﬁnition, see page 242). In his view, the segmental organisation is frequently based, at least in part, on the inability of otherwise similar tissues to exchange cells at their interface. There is no shortage of evidence in support of this view. Immiscibility of cells from neighbouring segmental units is found, for example, between Drosophila compartments (Lawrence and Johnston 1986), vertebrate rhombomeres (Guthrie and Lumsden 1991), and half-somites in the chick embryo (Stern and Keynes 1987).
Among the Ecdysozoa, external fertilisation is only found in the horseshoe crabs and in the largest, macrobenthonic representatives of the Priapulida. Internal fertilisation is found in the smallest, meiobenthic Cellular Darwinism and the Origin of Animal Form 17 Priapulida and in all remaining groups (Nematoda, Nematomorpha, Kinorhyncha, Loricifera, Tardigrada, Onychophora, and nearly all Arthropoda; external fertilisation found in the tiny meiobenthic mystacocarids is certainly derived within the crustacean lineage).
I suggest the name ‘genomorphen’ for this class of genes, to emphasize their key roles in generating organic form” (Krasnov 1997: 235, 237). It is fair to say that less extreme positions are emerging. Rather than seeing developmental decisions as the effect of single ‘developmental genes’, many researchers regard them as ‘logical operations’ allowing the effects of many signals, both short and long range, to be integrated through the action of multiple transcription factors. ’s (2000) demonstration that integration of several transcription factors (Pointer, dTCF, Mad, Twist, and Tinman) determines the speciﬁcity of the Ras inductive signalling towards muscle and heart development in Drosophila.
The development of animal form by Alessandro Minelli