Why do the shortest eukaryotic cell cycles in early animal embryos occur without significant weight increase, and which phase of the cell cycle is most reduced?
Understand the Problem
The question is asking about the characteristics of cell cycles in early animal embryos, specifically why these cycles occur without a significant increase in the embryo's weight and which phase of the cell cycle is most reduced. This involves concepts from biology related to cell division and the cell cycle.
Answer
Cleavage divisions in embryos skip G1 and G2, leading to rapid cycles without weight increase.
The shortest eukaryotic cell cycles occur during the cleavage divisions in early animal embryos, where there is no significant weight increase because cells divide without growing. These rapid cycles largely skip the G1 and G2 phases, making the S phase very short.
Answer for screen readers
The shortest eukaryotic cell cycles occur during the cleavage divisions in early animal embryos, where there is no significant weight increase because cells divide without growing. These rapid cycles largely skip the G1 and G2 phases, making the S phase very short.
More Information
In early embryonic cell divisions, cells focus on rapid division rather than growth, enabling the embryo to increase cell numbers quickly, which is vital for early development.
Tips
A common mistake is assuming that cell cycle phases must always include G1, S, G2, and M. In early embryonic stages, some phases can be minimized or skipped.
Sources
- The Eukaryotic Cell Cycle - NCBI - ncbi.nlm.nih.gov
- The shortest eukaryotic cell cycles of all occur in early animal... - coursehero.com
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