Submitted by: Submitted by debjenks
Views: 57
Words: 583
Pages: 3
Category: Science and Technology
Date Submitted: 11/09/2014 09:36 AM
Prophase I: In this phase the chromatin fivers begin to coil tightly in order to condense into chromosomes. Each chromosome will be joined at the middle by a centromere. During early prophase, spindle fibers begin to form. These spindle fibers are composed of microtubules and proteins and are responsible for movement during the process of Meiosis. During the second half of prophase, the nucleolus breaks down. Kinetochores, which are specialized regions of the centromere attach to the spindle fiber. This attachment will cause the homologous pairs will begin to move towards the center of the cell. Metaphase I: The nuclear membrane disappears during metaphase. In an animal cell the centrioles will align at opposite poles of the cell and polar fibers will continue to extend to the center of the cell from the poles. Homologous pairs will align at the center of the cell at the metaphase plate, perpendicular to the spindle fibers. Before anaphase begins a checkpoint will occur. This checkpoint will check for misalignment. Anaphase I: In anaphase the homologous chromosomes separate. As the separate they will move it to opposite sides of the cell. While the separation of the homologous chromosomes is occurring the spindle fibers that are not attached to the chromosomes will extend to elongate the cell. Telophase I: During telophase one, the spindle microtubules will disappear and two clusters of chromosomes can be seen. Each cluster will contain one of the homologous pair. Cytokinesis will occur at this stage. The cytoplasm will split and either a cleavage furrow or a new cell plate will form in order to completely split the two cells. The result of this process is two haploid daughter cells. They are haploid because they only have one part of a chromosome. After telophase I and cytokinesis occur little or no interphase will occur between telophase I and prophase 2
Prophase II: Chromosomes recondense and spindle microtubules ...