Definitions
from The Century Dictionary.
- Dextral, as a shell; turning or turned to the right, as the whorls of a spiral shell; dextrotropous: opposed to læotropic.
- Turning to the right hand or in a clockwise direction: said of the direction of cleavage in the eggs of certain invertebrates.
Etymologies
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Examples
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Such a division is described as dexiotropic if the clockwise daughter cell (in animal pole view) is the closer to the animal pole; in a laeotropic division the counterclockwise cell is closer to the animal pole.
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(D) Fifth cleavage: the third-quartet micromeres are formed by dexiotropic division of macromeres; cells of both the first and second micromere quartets divide also dexiotropically, but with a slight delay.
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Division of the 2m cells occurs with a slight asynchrony matching the timing of their birth; these divisions are all equal and dexiotropic, but nearly transverse
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Mitotic spindles in the quadrant founder cells are skewed clockwise, preparatory to dexiotropic division.
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Within each quadrant, the dexiotropic division of 1m
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Where a transverse division places sister cells at the same level of the egg axis, they are usually numbered with reference to the chirality of the previous division: if the mother cell formed by a dexiotropic division, then the clockwise product of this cell's next division is given a superscript 2 and the counterclockwise product a superscript 1.
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(D) Fifth cleavage: the third-quartet micromeres are formed by dexiotropic division of macromeres; cells of both the first and second micromere quartets divide also dexiotropically, but with a slight delay.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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Also applying to shellfish are dexiotropic and laeotropic, where the shell's spire turns to the right and left, respectively.
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In the 2d clone, the six latest-born nuclei form a unique pattern consisting of three laeotropically skewed columns; as development proceeds, the lower-left nucleus in this array (2d The third quartet micromeres are formed by the dexiotropic division of the 2 M macromeres.
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In the 2d clone, the six latest-born nuclei form a unique pattern consisting of three laeotropically skewed columns; as development proceeds, the lower-left nucleus in this array (2d The third quartet micromeres are formed by the dexiotropic division of the 2 M macromeres.
PLoS ONE Alerts: New Articles Morgan Q. Goulding 2009
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