Table of Contents
- 1 What happened when an M phase cell was fused with S phase cell?
- 2 Which events occur during the G1 phase and S phase of the cell cycle?
- 3 What would happen when a cell in S phase of cell cycle is fused with a G2 phase cell?
- 4 What would happen when a cell in S phase of cell cycle is fused with a G2 phase cell explain?
- 5 What would happen if S phase was eliminated?
- 6 What happens when’s phase cell is fused with G1?
- 7 What happens before a cell enters the S phase?
What happened when an M phase cell was fused with S phase cell?
1) Fusing a cell in mitosis with an S phase cell caused the S phase cell to immediately enter mitosis, condensing even the unreplicated segments of the chromosomes. If cytoplasm is taken from mature eggs and injected into interphase cells in embryos they immediately go into mitosis.
Which events occur during the G1 phase and S phase of the cell cycle?
Interphase is composed of G1 phase (cell growth), followed by S phase (DNA synthesis), followed by G2 phase (cell growth). At the end of interphase comes the mitotic phase, which is made up of mitosis and cytokinesis and leads to the formation of two daughter cells.
What happens if a cell in the S phase and G1 phase combine?
When a cell in the S phase was fused with a cell in G1, the G1 nucleus immediately entered the S phase – DNA was synthesized. The results of fusing a G1 cell with a cell in the S or M phase of the cell cycle suggest that molecules present in the cytoplasm during the S or M phase control the progression to those phases.
What would happen if a cell was inhibited during the S phase of its cycle?
A cell is inhibited during S phase of its cycle. What would occur in a cell if the production of cyclins halted during the cell cycle? The cell would remain the G2 phase and would not enter mitosis. What are a type of internal signal molecule used in controlling the cell cycle?
What would happen when a cell in S phase of cell cycle is fused with a G2 phase cell?
In the first set of experiments, S-phase cells were fused with G2-phase cells. Although chromosome replication continued in the S nucleus of the heterokaryon, the G2 nucleus was unable to synthesize DNA, indicating that the G2 nucleus is prevented from entering further rounds of DNA replication.
What would happen when a cell in S phase of cell cycle is fused with a G2 phase cell explain?
Fusing G2 cells with S phase cells, however, yielded a quite different result: The G2 nucleus was unable to initiate DNA synthesis even in the presence of an S phase cytoplasm.
What does S stand for and what occurs in this stage?
The S stage stands for “Synthesis”. This is the stage when DNA replication occurs.
What key event happens during the S phase?
The most important event occurring in S phase is the replication of DNA. The aim of this process is to produce double the amount of DNA, providing the basis for the chromosome sets of the daughter cells.
What would happen if S phase was eliminated?
S phase cyclins regulate progression through the cell cycle during DNA replication. If a cell has not properly copied its chromosomes or there is damage to the DNA, the CDK will not activate the S phase cyclin and the cell will not progress to the G2 phase.
What happens when’s phase cell is fused with G1?
When the S phase cell is fused with a cell in G1, it reveals that both nuclei in the heterokaryon replicate DNA. This suggests that the cytoplasm of the S phase cell contains an activator or regulator of DNA replication. The regulator is called S phase activator.
How are interphase nuclei fused during the cell cycle?
Interphase nuclei during the phases of the cell cycle can be fused by various combinations: When the S phase cell is fused with a cell in G1, it reveals that both nuclei in the heterokaryon replicate DNA. This suggests that the cytoplasm of the S phase cell contains an activator or regulator of DNA replication.
What happens during the G2 phase of mitosis?
G2 phase. Following S phase, the cell enters G 2 phase. During G 2, the cell synthesizes a variety of proteins. Of particular significance to the cell cycle, most microtubules – proteins that are required during mitosis – are produced during G 2. G0 phase. Not all cells are continually replicated.
What happens before a cell enters the S phase?
Before the cell commits to the S phase it goes through the G1/S checkpoint, also called Enter S, where the nutritional status of the cell and the DNA integrity are checked. This is an especially important step for a cell about to enter the S phase.