Download How the Snake Lost its Legs: Curious Tales from the Frontier by Lewis I. Held Jr PDF

By Lewis I. Held Jr

How did the zebra particularly get its stripes, and the giraffe its lengthy neck? what's the technological know-how in the back of camel humps, leopard spots, and different animal oddities? Such questions have interested us for hundreds of years, however the increasing box of evo-devo (evolutionary developmental biology) is now offering, for the 1st time, a wealth of insights and solutions. Taking suggestion from Kipling's 'Just So Stories', this booklet weaves rising insights from evo-devo right into a narrative that offers startling factors for the foundation and evolution of features around the animal country. Held's distinct and fascinating sort makes this narrative either enlightening and wonderful, guiding scholars and researchers via even complicated innovations and inspiring a fuller figuring out of the most recent advancements within the box. the 1st 5 chapters hide the 1st bilaterally symmetric animals, flies, butterflies, snakes, and cheetahs. a last bankruptcy surveys fresh effects a couple of menagerie of alternative animals

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Extra resources for How the Snake Lost its Legs: Curious Tales from the Frontier of Evo-Devo

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3f) that match those of the wing and appear to have remained unaltered over the eons (Fig. 3e). The identity of these sensilla has been verified by various approaches, including genetic mosaics [1542], partial homeosis [238,423], bithorax phenocopy [1346], and manipulation of Ubx expression as a function of time [1872,1904]. 3 How the fly transforms a wing into a gyroscope. 871mm CUUK2470-02 CUUK2470/Held ISBN: 978 1 107 03044 2 September 11, 2013 13:51 How the fly got its gyroscopes 23 the cuticle has been as gratifying as finding a pharaoh’s tomb with its treasures intact (boldface added): It has long been recognized that the haltere is homologous to the wing.

Similarly, the ventral radius bears a field of sensilla which is almost identical to that found on the ventral scabellum. A sensilla are elliptical, low-profile sensilla bearing sockets (type 6). There are four and occasionally five sensilla in this field, arranged in a diamond pattern. The ventral scabellum bears five elliptical high-profile sensilla with sockets which share the same size range and pattern of distribution. In fact, it is only the difference in dome prominence which makes this field distinguishable from that of the wing.

It enables veins to form via blistered (bs) [508,1657,1873]. Serrate (Ser) mediates ap’s activation of wg and sharpens the margin together with cut, while scute (sc) and achaete (ac, not shown) promote bristle formation. Unlike its role in the leg outgrowth, Distal-less (Dll) does not mediate wing outgrowth [821]. Butterflies make their wings in basically the same way [343]. Based mainly on refs. [470,965,2350] with data added from refs. [515,723,1365,1520, 2018]. q. Features of wing development that depend on the circuitry in p.

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