Mitosis Exercise 1: Interphase 1.1 There is the preparation of DNA for replication and cell growth. Additionally, this is DNA synthesis. Cell growth and preparation of DNA for replication take place in G1 phase while DNA synthesis occurs in S phase. 1.2 By looking for the intact solid nucleus and at interphase individual chromosomes are not seen easily. 1.3 Red blood cells frequently divide, red blood cells divide at a rate of two million for every second. On the other hand, nerve cells infrequently divide. The cell division of red blood cells takes a short time during the interphase stage, approximately twenty hours as compared to nerve cell. In G1, S, G2 phases, red blood cell takes about eight, six and five hours respectively. Exercise …show more content…
In picture 1, the chromosomes are being pulled apart to the opposite cell poles, which is the feature the cells indicate during anaphase stage. In picture 2, the condensed chromosomes appear with no particular order, and the nucleus is visible which are characteristic the cells show during the prophase stage. Picture 3 shows metaphase stage while picture 4 is a telophase stage. In picture 3, the chromatids lined up in the middle of cells which can only be observed during the metaphase stage. In picture 4, two distinct regions of the chromosomes on the opposite ends of the cells signifying it is a telophase. Picture 5 is anaphase stage while picture 6 is telophase stage. In picture 5, the chromosomes are being pulled towards the cell poles indicating it is anaphase stage. In figure 6, two distinct areas of chromosomes on the opposite ends of the cells are evidenced justifying it is a telophase stage. Picture 7 represents anaphase stage while picture 8 shows prophase stage. The chromosomes are pulled towards opposite of cell poles by the formation of spindle fibre in picture 7, a situation which can only be observed during the anaphase stage. Individual condensed chromosomes appear with the order, and the nucleus is easily identified showing the cell is in its early prophase stage. Exercise 4: cytokinesis