Cell Growth in Embryos: Is it Actively Inhibited?

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An embryo can increase its cell number without a corresponding increase in overall size due to rapid cell division that bypasses the growth phases of the cell cycle, specifically the G1 and G2 phases. This rapid division is facilitated by the egg being an oversized cell, allowing for quicker replication of cells while maintaining a constant embryo size. The discussion raises questions about the mechanisms that inhibit the G1 and G2 phases during this process, suggesting that the unique properties of the egg cell play a crucial role in this phenomenon.
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An embryo can increase its cell number without increasing
its overall size.Is this because cell growth is actively inhibited?
 
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sontag said:
An embryo can increase its cell number without increasing
its overall size.Is this because cell growth is actively inhibited?
Do you mean increasing the size of the embryo, or decreasing the size of the cell?
 
I mean keeping the embryo the same size but increasing the cell number,
presumably just by increasing the number of cell walls.
 
The constant size of the embryo is due to the rapid division of the cells. The cell goes through a rapid a cell cycle which abolish the growth period between DNA replication steps (i.e. no G1 or G2 phase). The G1 and G2 phase can be abolish because the egg is an oversize cell.
 
What stops G1 and G2?
 

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