HOLOBLASTIC EGG Meaning and
Definition
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A holoblastic egg refers to a type of egg that undergoes complete or total cleavage during embryonic development. This term is most commonly used in the context of animal reproduction, particularly among organisms that produce eggs to reproduce.
In a holoblastic egg, the entire zygote or fertilized egg divides entirely into smaller cells known as blastomeres through the process of cleavage. This process leads to the formation of a multicellular structure which eventually develops into an embryo. The cleavage occurs through a series of rapid and equal divisions, resulting in the production of blastomeres that are roughly similar in size and shape.
Holoblastic eggs can be further classified into two subtypes based on the distribution of yolk within the egg. These subtypes are known as isolecithal and mesolecithal eggs. Isolecithal eggs have relatively small amounts of yolk and are distributed evenly throughout the cytoplasm, resulting in uniform division during cleavage. Mesolecithal eggs, on the other hand, contain a moderate amount of yolk which is concentrated at one end of the egg. In this case, cleavage occurs predominantly in the region without yolk, leaving a large yolk-filled area known as the vegetal pole.
Overall, the attribute of holoblastic cleavage is a defining characteristic of certain types of eggs, enabling the development of multicellular organisms from zygotes by undergoing complete cell division.
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One the whole of the yolk of which undergoes segmentation and enters directly into the formation of the embryo.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for HOLOBLASTIC EGG
- goloblastic egg
- boloblastic egg
- noloblastic egg
- joloblastic egg
- uoloblastic egg
- yoloblastic egg
- hiloblastic egg
- hkloblastic egg
- hlloblastic egg
- hploblastic egg
- h0loblastic egg
- h9loblastic egg
- hokoblastic egg
- hopoblastic egg
- hoooblastic egg
- holiblastic egg
- holkblastic egg
- hollblastic egg
- holpblastic egg
- hol0blastic egg
Etymology of HOLOBLASTIC EGG
The term "holoblastic egg" is derived from the combination of two Greek words: "holos" meaning "whole" or "complete", and "blastos" meaning "bud" or "germ". The term is used in embryology to describe a type of egg cleavage or division that occurs in many organisms during embryonic development, where the entire egg is divided into separate cells. Hence, "holoblastic" refers to the complete or total cleavage of the egg.
