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Function of vitellus

Specify the function of vitellus within the vertebrate egg? Classify these eggs in accordance with the amount of vitellus within them?

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Vitellus (yolk) is defined as the nutritive material which accumulates within the cytoplasm of the egg (zygote) with function of nourishing the embryo. In accordance with the amount of vitellus within them, the vertebrate eggs are classified as

a) Oligolecithal (little yolk),

b) Centrolecithal, or heterolecithal (more yolk diffusely distributed) and

c) Telolecithal (more yolk concentrated in one end of the egg).

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