Birds utilize discoidal meroblastic cleavage. Which part of the avian egg actually undergoes division to form the blastoderm?
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Correct answer: The blastodisc
Because avian eggs are extremely telolecithal, cleavage is restricted to a small yolk-free disc of cytoplasm at the animal pole called the blastodisc. The surrounding yolk mass remains undivided and provides nutrients to the developing embryo throughout incubation.
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