Types of eggs
Types of eggs
Eggs classified according to the amount or distribution of yolk.
According to the amount of yolk , the egg arranged into the following:
1. Alecithal : Without yolk. eg. mammal
2. Oligolecithal : Small amount. eg. amphioxus
3. Mesolecithal: Moderate amount. eg. toad
4. Polylecithal : Large amount . eg. Bird
According to distribution of yolk :
1. Homolecithal: The yolk equally distributed throughout the
cytoplasm. Eg. Amphioxus.
2. Centrolecithal: The yolk concentrated in a net like structure arround
the nucleus. Eg. Insects.
3. Telolecithal: The yolk deposited in vegetal pole. Light telolecithal
type with moderate amount of yolk (eg. Toad). Heavy lellecithal type
with large amount of yolk (eg. Bird).
