A blastula having the form of a disc of cells on top of the yolk.
- When the membranes surrounding the peripheral nuclei fuse to form the 6000 cells of the cellular blastoderm, they enclose 175-225 polyploid yolk nuclei within a large syncytial yolk cell.
- As a result, the blastodisc on the yolk becomes a blastoderm.
- When the egg is laid, the blastoderm contains several hundred cells.
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