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Cell Division – Mitosis, Meiosis1 and Meiosis2 |
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Cell Division – Mitosis, Meiosis1 and Meiosis2
Mitosis defined: is nuclear division that produces two daughter nuclei, each with the same number and kinds if chromosomes as the parental nucleus. Mitosis is one of the stages in the life cycle of a cell. Mitosis is the common type of nuclear division that occurs in growth and repair of the body. Humans begin life as a single cell but eventually have one hundred trillion cells as an adult, due to mitosis. Most of mitosis cell division in adults occurs in tissues such as the epidermis of the skin, the lining of the digestive and respiratory tracts, and the lymphoid tissue that produces blood cells.
Mitosis is the process by which the contents of the eukaryotic nucleus are separated into two genetically identical packages. Chromatin is condensed into chromosomes and centosomes have duplicated prior to the beginning of mitosis during G2 of interphase. Mitosis is divided into four stages, prophase, metaphase, anaphase, and telephase.
During early prophase, chromosomes are duplicated. As mitosis begins, chromosomes condense, they become visible under a light microscope. They appear as sister chromatids joined at the centromere. The number of centromeres is the same nu
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Below are additional random excerpts from the paper...
Metaphase 1 homologous pairs align as they reach the midplane of the spindle and attach to spindle fibers.
The differences between mitosis and meiosis 1 are homologous chromosomes pair and undergo crossing-over during prophase 1 of meiosis but not during mitosis. Secondly, paired homologous chromosomes align at the metaphase plate during metaphase 1 in meiosis. Individual (duplicated) chromosomes align at the metaphase plate during metaphase in mitosis. The final difference is homologous chromosomes (with centromeres intact) separate and move to opposite poles during anaphase 1 in meiosis. Sister chromatids separate becoming daughter chromosomes that move to opposite poles during anaphase in mitosis.
Meiosis is a specialized process that reduces the chromosome number and occurs only during the production of gametes. Mitosis is a process that occurs during growth and repair of all tissues. The human life cycle uses both mitosis and meiosis. Mitosis ensures that each somatic cell will have the diploid number of chromosomes.
During prophase 1, the nuclear envelope disappears and the spindle forms. The homologous pairs undergo synapsis.
Telophase 1 the spindle disappears in nuclear membranes may reform and the two nuclei, each containing a haploid set of chromosomes, are separate as cytokinesis divides cytoplasm. The daughter cells have one chromosome from each homologous pair. Interkinesis phase the chromosomes still consist of two chromatids.
Anaphase is the stage where the centromeres divide. The sister chromatids separate, becoming
Some topics in this essay:
Meiosis2 Mitosis,
Daughter Cells,
daughter cells,
sister chromatids,
homologous chromosomes,
spindle fibers,
1 meiosis,
opposite poles,
meiosis mitosis,
metaphase plate,
parental cell,
daughter chromosomes,
Cell Division,
align metaphase plate,
chromosomes align metaphase,
sister chromatids joined,
haploid daughter cells,
sexually reproducing organisms,
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Approximate Word count = 1084
Approximate Pages = 4 (250 words per page double spaced)  |
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