Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Exhibiting cleavage in which the entire egg separates into individual blastomeres.
from The Century Dictionary.
- Wholly germinal: applied by Remak to those eggs in which the whole yolk is formative—that is, undergoes segmentation in development: opposed to meroblastic. Mammals, excepting monotremes, have holoblastic eggs. See cut under
gastrulation .
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Biol.) Undergoing complete segmentation; composed entirely of germinal matter, the whole of the yolk undergoing fission; -- opposed to
meroblastic .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective biology, of an egg
Cleaving , andseparating into separateblastomeres .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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In the mammalian ova the nutritive yolk or deutoplasm is small in amount and uniformly distributed throughout the cytoplasm; such ova undergo complete division during the process of segmentation, and are therefore termed holoblastic.
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WHOLE cell; hence Remak called it TOTAL segmentation, and the ova in question holoblastic, or "whole-cleaving."
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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Although the mass of the food-yelk may be very large in the ova of the discoblastic vertebrates, nevertheless in every case a blastula is developed from the morula, as in the holoblastic ova.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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The multiplicity or loss of the vitellogenin (vtg) gene family in vertebrates has been argued to have broad implications for the mode of reproduction (placental or non-placental), cleavage pattern (meroblastic or holoblastic) and character of the egg (pelagic or benthic).
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