What is the major difference between the processes occurring mitosis and meiosis I in a diploid organism?
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Mitosis and meiosis are both processes by which cells reproduce, but there are distinct differences between the two. While new cells are generated during mitosis, meiosis is a special type of cell division that produces sex cells for reproduction. The two processes were discovered by different scientists. Meiosis was discovered by German biologist Oscar Hertwig while German physician Walther Flemming is credited with the discovery of mitosis. Show
Comparing mitosis and meiosis | Cells | MCAT | Khan Academy The Purpose of the ReproductionOnly sexually reproductive organisms utilize meiosis. The role of the process is to produce sex cells and to repair genetic defects in germ line cells (the sex cells). Both sexual and asexual organisms go through the process of mitosis. It happens in the cells of the body known as the somatic cells and produces cells related to growth and repair. Mitosis is essential for asexual reproduction, regeneration, and growth. It does not make sex cells or gametes. Number of Daughter CellsIn meiosis, four haploid cells containing half the amount of chromosomes are produced at the end of the process. Alternatively, two diploid cells, containing two sets of chromosomes, are produced as a result of mitosis. Composition of the Daughter CellsThe daughter cells produced at the end of meiosis are completely different from the original parent cell and they include a mix of both the maternal and paternal genes, leading to genetic diversity during sexual reproduction. The daughter cells created in mitosis are genetically the same as the original parent cell. Phases of Reproduction of the CellsMeiosis has two phases for the reproduction of cells which results in there being two cell divisions. The first phase includes prophase I - during which the most important events of meiosis occur, metaphase I, anaphase I, telophase I, and cytokinesis. During the second phase, these processes repeat again with the cells that were formed at the end of the first phase. In mitosis, the cells divide only once and this is via one phase which includes steps such as prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis. Pairing of HomologuesMeiosis involves the pairing of homologues, chromosomes similar to other chromosomes, whereas mitosis involves no pairing of homologues. Differences in AnaphaseDuring the anaphase of meiosis, the sister chromatids do not separate. In anaphase I, the chromosomes are double-stranded and in Anaphase II, they are single stranded. During anaphase in mitosis, the sister chromatids do separate at the centromeres and the chromosomes are single stranded. Differences in TelophaseIn mitosis, the spindle fibres recede fully during telophase, but this is not the case with telophase I of meiosis. Also the nucleoli reappear in mitosis but not in meiosis. Mixing of ChromosomesIn meiosis, the chromosomes cross over causing mixing. Mitosis, on the other hand, does not involve crossing over of the chromosomes. References
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Last Updated: Feb 26, 2019 Written by Deborah FieldsDeborah holds a B.Sc. degree in Chemistry from the University of Birmingham and a Postgraduate Diploma in Journalism qualification from Cardiff University. She enjoys writing about the latest innovations. Previously she has worked as an editor of scientific patent information, an education journalist and in communications for innovative healthcare, pharmaceutical and technology organisations. She also loves books and has run a book group for several years. Her enjoyment of fiction extends to writing her own stories for pleasure. CitationsPlease use one of the following formats to cite this article in your essay, paper or report:
Suggested Reading What is a major difference between mitosis and meiosis in a diploid organism?Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell.
What is a major difference between mitosis and meiosis I?Mitosis results in two nuclei that are identical to the original nucleus. Meiosis, on the other hand, results in four nuclei, each having half the number of chromosomes of the original cell. In animals, meiosis only occurs in the cells that give rise to the sex cells (gametes), i.e., the egg and the sperm.
What is a major difference between meiosis II and mitosis in a diploid animal quizlet?half the number of chromosomes and one-fourth the amount of DNA. Homologous chromosomes of a pair are separated from each other. What is a major difference between meiosis II and mitosis in a diploid animal? Meiosis II occurs in a haploid cell, while mitosis occurs in diploid cells.
What is the difference between mitosis and meiosis?Mitosis produces two genetically identical “daughter” cells from a single “parent” cell, whereas meiosis produces cells that are genetically unique from the parent and contain only half as much DNA. Most cells in the body regularly go through mitosis, but some do so more often than others.
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