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

By Lewis I. Held Jr

How did the zebra relatively get its stripes, and the giraffe its lengthy neck? what's the technological know-how at the back of camel humps, leopard spots, and different animal oddities? Such questions have involved us for hundreds of years, however the increasing box of evo-devo (evolutionary developmental biology) is now supplying, for the 1st time, a wealth of insights and solutions. Taking concept from Kipling's 'Just So Stories', this booklet weaves rising insights from evo-devo right into a narrative that offers startling factors for the starting place and evolution of characteristics around the animal state. Held's detailed and interesting variety makes this narrative either enlightening and unique, guiding scholars and researchers via even complicated techniques and inspiring a fuller realizing of the most recent advancements within the box. the 1st 5 chapters disguise the 1st bilaterally symmetric animals, flies, butterflies, snakes, and cheetahs. a last bankruptcy surveys contemporary effects a few menagerie of alternative animals

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T2 denotes the second thoracic body segment. 871mm CUUK2470-02 CUUK2470/Held ISBN: 978 1 107 03044 2 September 11, 2013 13:51 How the fly tattooed its arms 31 the tarsal region that makes contact is rows 7 and 8. What better place to put a brush? Indeed, the transverse rows not only look like a hair brush but function like one too. After collecting dust from its eyes, the fly rubs the transverse rows of its forelegs together to rid itself of the dust altogether. Interestingly, the third legs separately evolved (via Ubx) transverse rows between rows 1 and 2 [965,2043] – the ideal spot for a brush to clean the wings.

J) Dorsal cells express the transcription factor Apterous (Ap), which, like En, is made by a homeobox-containing selector gene (ap). (k) Ap turns on wingless (wg), which encodes a morphogen, at the edge. (l) Wg proteins (solid circles) are secreted by a stripe of cells at the D/V interface. They diffuse widely in both directions, eventually creating a stable gradient. All cells can hear the Wg signal. (m) Cells assess their distance from the D/V line (y coordinate) by the amount of Wg, denoted by numbers inside squares.

A–i. Stages of patterning along the anterior–posterior (A–P or x) axis. Adapted from refs. [104,965]. (a) A right wing disc is depicted with its pouch removed, enlarged, and rendered as an oval. Dots above the pouch denote bristle precursors on the thorax. ) cells, though real cells are less regular and more hexagonal. A mature pouch actually has 1000s of cells, but fewer are shown because most events (b–o) occur when it has 10s or 100s of cells. The points of the compass (A, P, D, V) indicate cardinal directions (anterior, posterior, dorsal, ventral).

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