<P> The germinal disc, also called the blastodisc, is a small, circular, white spot (approximately 2 - 3 mm across) on the surface of the yellow yolk of a bird's egg . </P> <P> The blastodisc refers to a round single - cell layer of cells inside the blastula from which the embryo is going to form . </P>

What is the function of the germinal disk in an egg
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