2. What is the function of the
vitellus in the vertebrate egg?
How are these eggs classified
according to the amount of
vitellus within them?

Gap-fill exercise

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Vitellus (yolk) is the material
that accumulates in cytoplasm of
the egg () with the function of
the embryo. According to
amount of vitellus in , the
vertebrate eggs are as
oligolecithal (little yolk), ,
or heterolecithal (more yolk
distributed) and telolecithal (more
concentrated in one end the egg).