Tuesday, February 15, 2011

Interphase

Today in class we went over something that occurs in the cell cycle called interphase. From what it looks like , there are many steps in interphase that will take place in the cell cycle. First of all most of the cell cycle is spent in interphase. This is where the cell will perform its usual functions depending on its location in the body. Interphase will start off at the G1 checkpoint or the first growth. This stage is where the cell is committed to split when growth signals are present and all of the nutrients are available and ready to go. Now it moves to the S stage where the DNA synthesis also know as replication of itself. So DNA replication has resulted in in two chromosomes and two chromatids will stay attached until they are split in mitosis. Now we move to the G2 stage or the second growth. In this stage the process is very simple, this stage is basically the mitosis checkpoint , after the DNA is replicated this stage will make sure that the DNA is prepared for mitosis. If the DNA is damaged Apoptosis will occur because the DNA can not be repaired. The Miotic Stage is the final stage of interphase. In this stage is known as the spindle assembly checkpoint. Here mitosis will occur and that is where cells are divided. There is also cytokinesis will also happen and that is the splitting of the cytoplasm. During these phases daughter chromosomes will go to the two daughter nuclei by the mitotic spindle. When the dividing of the cytoplasm is done there are then two daughter cells present.

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