This is credited as a difficult feature if each leg is separated by at least a 45?angle from the body axis and the legs are straight or almost straight.
32.
In the classic pattern for echinoderms, the bilaterally symmetrical larva is replaced by a pentamerously symmetrical stage at metamorphosis, with the latter's body axis bearing no relationship to that of the larva.
33.
The functions include the formation of the body axis, i . e ., the polarity of the embryo, the segmentation of the body, and the specialization of individual segments into different organs.
34.
The flight mechanism of this species is similar to the one found in other amazons, and involves strokes below the body axis, unlike most birds whose wings flow above their bodies in flight.
35.
On the lower braincase the " processus basipterygoideus " has the form of a plate, is oriented along the body axis, and has an additional boss parallel to the " tubera basilaria ".
36.
Gurken RNA is a key maker of the second body axis, the one that says, here is the dorsal side where wings will someday grow, and here the ventral, where legs may soon sprout forth.
37.
Given their underfocused nature, wide fields of view, and high light-collecting ability, the ocelli are superbly adapted for measuring changes in the perceived brightness of the external world as an insect rolls or pitches around its body axis during flight.
38.
This would make the axes of symmetry consistent with that of other bilaterian phyla and appears to be consistent with the embryological development, in which the body axis folds to bring the shells from the dorsal surface to their mature position.
39.
Noggin was originally isolated from the aquatic-frog genus " Xenopus . " The discovery was based on the organism's ability to restore normal dorsal-ventral body axis in embryos that had been artificially ventralized by University of California, Berkeley because of this ability to induce secondary axis formation in frog embryos.
40.
But importantly, for the discovery that Hox ( homeobox ) genes were found in vertebrates and a wide variety of animals, conserved, and were expressed in different regions of the vertebrate embryonic body axis, and that mammal Hox genes could function as anterior-posterior embryonic regulators of body axis specification, in flies as well as mammals.
