Many animals lay eggs to give birth to their young ones. Since a variety of life forms exist on this planet, the eggs they lay are also different. There are three types of eggs based on the distribution of yolk in the egg.
- Homolecithal Egg
- Telolecithal Egg
- Centrolecithal Egg
This article focuses on telolecithal and centrolecithal eggs and the differences between them.
Telolecithal Egg
An egg that has a large quantity of yolk, where the yolk is unevenly distributed all through the cytoplasm, is referred to as a telolecithal egg. The yolk in this type of egg is concentrated more towards the vegetal pole. Animals that lay telolecithal eggs are birds, reptiles and fishes.
Centrolecithal Egg
The eggs that have their yolk concentrated in the centre of the shell are referred to as centrolecithal eggs. They have a thin layer of cytoplasm covering the yolk. Arthropoda animals lay centrolecithal eggs.
Telolecithal vs. Centrolecithal Egg
| Telolecithal Egg | Centrolecithal Egg |
|
Definition |
|
| Eggs that have their yolk distributed throughout the cytoplasm and concentrated towards the vegetal pole are referred to as telolecithal eggs. | Eggs that have their yolk evenly distributed are referred to as centrolecithal eggs. |
|
Characteristic Feature |
|
| The yolk is concentrated towards the vegetal pole. | There’s a thin layer of cytoplasm around the yolk. |
|
Examples |
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| Birds, fishes and reptiles | Arthropods |
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Frequently Asked Questions on Difference between Telolecithal and Centrolecithal Egg
What do you mean by Alecithal?
The eggs that have little or no yolk are referred to as alecithal eggs, such as human eggs.
What is a regulative egg?
An egg that does not have predetermined developmental potentialities is known as a regulative egg. Removal of a few blastomeres does not affect the development of such eggs.
What is a mosaic egg?
An egg that has predetermined developmental potentialities is known as a mosaic egg. Removal of any portion of the egg leads to the absence of the particular organ in the individual.
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