Question

Part C: Mitosis the body nceds more cells (for growth or repair), the way to produce new ones is for existing cells to divide. The series of events that leads to cell division is called the cell cycle. The cell cycle has distinct phases-most of the time, a cell is in itself is divided into three phases: Gl, in which a cell is engaged in the normal activity of thar cell making protcin, gencrating ATT, etc.l; S, the phase when DNA replicates, and G2, the final szage before the cell divides. The actual process of cell division is divided into two main coemponentse Mitosis and cytokinesis. Mitosis is the division of the chromosomes and cytokinesis is the division of the cytoplasm. Mitosis takes place in discrete phases: prophase, metaphase, somes and similar cellalar components. The goal of today is to identify the main characteristics of each mitotic phase. 1. Prophase: In prophas, the chromatin condenses into chromosomes that are visible in the nuckus using a light microscope. This is important because the smalles,more compact chromosoemes won't tangle when the cheomosomes (sometimes called prometaphase. This is crnical, because the dup!cated chromosomes must be free to separate to separate to opposite sides. The naclear envclope brcaks down ldisintegrates) during the later part of this phasc opposite sides of the cell. Spindles grow from centrioles at each end of the cell and attach to the chromosomes. 2. Metaphase In metaphase, the duplicated chromosomses line up on the metaphase plate or equator of the cell This 3. Anaphase: In anaphase, the duplicated chromosomes move away from the equator, with one full hromosome of 4. Telophasc: In telophase, the chromosomes move close to the poles and a nuclear cavelope re-fors around each set In late tclophase, cytokinesis occurs. In cytokinesis, the cytoplasm of the cell divides in two, in a process called furrowing is important because it ensures that each duplicated pair can easily part to opposite sides of the cell the duplicated chromosome moving to cach poke of the cell. of chromosomes, creating, for a moment, one cell with two nuclei in animal cells. In furrowing, the cell pinches in at the middle until two separase daughter cells are formed, each with its own identical naclei. Prophase Telophase PCUEE 4-1 Interphase and the stages of mitosis Mitosis Get a slide with cither onion root tip or white fish blastula on it. View the slide at 400X magnification. (What objective will you use? circles below Find cells that represent cach of the phases of mitosis and draw the cell in the appropriate Prophase Metaphase LAB 4 The Cel 39

Answer 1

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