Chromosomes and Mitosis lab

Chromosomes and Mitosis lab - Justin Jacques L19 TA Austin...

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L19 11/3/07 TA: Austin Chromosomes and Mitosis Introduction: In this lab there were two parts. The first part consisted of animating chromosomal behavior. The second part of the lab consisted of actually studying mitosis, by observing 4 stages of mitosis with root tips of a Fava bean plant. Mitosis is defined as “a process of cell division which results in the production of two daughter cells from a single parent cell. The daughter cells are identical to one another and to the original parent cell.” There are 4 basic steps of Mitosis: Prophase, Metaphase, Anaphase, and Telophase. In Prophase “the chromatin, diffuse in interphase, condenses into chromosomes. Each chromosome has duplicated and now consists of two sister chromatids. At the end of prophase, the nuclear envelope breaks down into vesicles.” In Metaphase “the chromosomes align at the equatorial plate and are held in place by microtubules attached to the mitotic spindle and to part of the centromere.” In Anaphase “the centromeres divide, and sister chromatids separate and move toward the corresponding poles.” And in Telophase “Daughter chromosomes arrive at the poles and the microtubules disappear. The condensed chromatin expands and the nuclear envelope reappears.” This is all followed by a process called cytokinesis, which is when the cytoplasm divides into two identical daughter cells; this completes the process of Mitosis. Chromosomes are made up of chromatin. Chromatin is basically DNA wrapped around proteins called histones. Chromatin makes chromosomes visible as a distinct entity with distinct morphological feature during cell division. Plant and animal cell mitosis are very different. Centrioles are found only in animal cells. In plants the nuclear and cell division are mainly localized in special regions called meristems. This rapidly dividing region will either elongate the tips of stems and roots or expand the girth of the plant. In animal cells, cells divide everywhere, all the time. The division process is essentially the same for plants and animals. The main difference comes when it is time for the cytoplasm to divide. A plant cell builds a new
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This note was uploaded on 04/17/2008 for the course BIOLOGY 41 taught by Professor Albaker during the Spring '08 term at New Hampshire.

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Chromosomes and Mitosis lab - Justin Jacques L19 TA Austin...

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