09-11 mitosis

09-11 mitosis - Mitosis and Cell Cycle Early Pioneers W....

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Mitosis and Cell Cycle
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Early Pioneers W. Flemming – German physiologist who documented chromosomal changes in salamanders thru cell division, 1882 Edouard van Beneden – Belgian biologist who discovered that the number of chromosomes was constant from cell to cell in a given organism, 1883 H.W. Waldeyer – German neurologist who coined the term chromosome (“colored body”), 1888
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Main Concepts After chromosomes are copied, mitosis distributes one chromosome copy to each of two daughter cells. Mitosis and cytokinesis produce two cells that are identical to the parent cell. Over their life span, eukaryotic cells go through a cycle that consists of four carefully controlled phases. In multicellular organisms, uncontrolled cell growth leads to cancer. Different types of cancer result from different types of defects in control over the cell cycle.
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Mitosis Mitosis is a division of the genetic material in the nucleus that produces daughter cells genetically identical to the parent cell. Mitosis is usually accompanied by cytokinesis, the division of the cytoplasm into the two daughter cells. Mitosis is the basis of asexual reproduction and is involved only in the production of somatic (body) cells. It is responsible for three key events in multicellular eukaryotes: (1) growth, (2) wound repair, and (3) cellular reproduction.
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Chromosomes Chromosomes contain a long double helix of deoxyribonucleic acid (DNA) wrapped around proteins. DNA carries the cell’s genetic information. The purpose of mitosis is to distribute this genetic material to daughter cells during cell division. Chromosomes can be stained with dyes and observed under the light microscope. Prior to mitosis, each chromosome is duplicated. As
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09-11 mitosis - Mitosis and Cell Cycle Early Pioneers W....

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