what is centromere
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Centromere: Definition & Structure Definition. In eukaryotes, a centromere is a region of DNA that is responsible for the movement of the replicated chromosomes into the two daughter cells during mitosis and meiosis. There is one centromere on each chromosome, and centromeres are responsible for two major functions.
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The sister chromatids in a chromosome are attached together by the? Best Answer: The centromere..... The centromere is a region, often found in the middle of the chromosome, involved in cell division and the control of gene expression. At this centromeric constriction the two mostly identical halves of the chromosome, the sister chromatids, are held together until late metaphase.inetochores and the spindle apparatus are responsible for the movement of the two sister chromatids to opposite poles of dividing cell nucleus during anaphase. Usually the mitosis is immediately followed by a cell division cytokinesis. However, mitosis and cytokinesis are separate processes and can be uncoupled.
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Centroid Centroid of a triangle. In mathematics and physics, the centroid or geometric center of a plane figure is the arithmetic mean (average) position of all the points in the shape. The definition extends to any object in n-dimensional space: its centroid is the mean position of all the points in all of the coordinate directions. Informally, it is the point at which a cutout of the shape could be perfectly balanced on the tip of a pin.
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Centromere Centromere proteins are also the autoantigenic target for some anti-nuclear antibodies, such as anti-centromere antibodies. Dysfunction and disease It has been known that centromere misregulation contributes to mis-segregation of chromosomes, which is strongly related to cancer and abortion.
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- home / medterms medical dictionary a-z list / centromere definition Medical Definition of Centromere Centromere: The 'waist' of the chromosome that is essential for the division and retention of the chromosome in the cell. The centromere is a uniquely specialized region of the chromosome to which spindle fibers attach during cell division.
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Chromosomes Chromosomes and Centromere. Centromere is the primary constriction in the chromatid of a chromosome where the spindle tubules become attached during cell division. A chromosome generally has only one centromere and such a chromosome is described as monocentric. Sometimes two centromeres may occur in the chromosome as in the case of maize plant.
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What Is the Difference Between a Centriole & a Centrosome? A centrosome is an organelle that is found close to the nucleus within the cytoplasm of cells. Centrosomes are key to the division of cells and produce the spindle fibers that are required during metaphase of mitosis. Each centrosome consists of two centrioles that are orientated at right-angles to each other.
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DIFFERENT TYPES OF ANIMAL CELLS AND THEIR FUNCTIONS Cells Vocabulary List & Definitions Centrosome (microtubule organizing center) A small body located near the nucleus-it has a dense center and radiating tubules. The centrosome is where microtubules are made.
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Centromere When the centromere is not functioning properly, the chromatids do not align and separate properly, thus, resulting in the wrong number of chromosomes in the daughter cells, and conditions such as Down syndrome. Word origin: From Latin centrum and Greek kentron + from Greek meros, part.
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Chromosome The centromere helps the chromatids attach to the spindle fibres during cell division, it is also concerned with the anaphase movement of the chromosomes, by which the spindle fibers pull the chromatids to the two opposite poles by their contraction during anaphase.
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How is finding the centroid different from finding the mean? The centroid is also sometimes called the center of mass or barycenter, based on its physical interpretation (it's the center of mass of an object defined by the points). Like the mean, the centroid's location minimizes the sum-squared distance from the other points.
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Centrosome In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell as well as a regulator of cell-cycle progression.he centrosome replicates during the S phase of the cell cycle. During the prophase in the process of cell division called mitosis, the centrosomes migrate to opposite poles of the cell. The mitotic spindle then forms between the two centrosomes. Upon division, each daughter cell receives one centrosome.
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- spindle fibers A collection of microtubules attached to a centromere during mitosis and meiosis that are responsible for the movement of the chromosomes to opposite poles. Spindle fibers align the chromosomes along the middle of the cell nucleus. The protein fibers formed during prophase of nuclear division; chromosomes attach to these fibers at the centromere. spindle The aggregation of microtubules that is involved in the movement and separation of chromosomes during mitosis and meiosis.
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Triangle Centroid Triangle Centroid. The geometric centroid (center of mass) of the polygon vertices of a triangle is the point (sometimes also denoted) which is also the intersection of the triangle's three triangle medians (Johnson 1929, p. 249; Wells 1991, p. 150). The point is therefore sometimes called the median point.
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Centroid of a triangle The centroid of a triangle is the point where the three medians (segments that connect a vertex to the midpoint of the opposite side) of the triangle intersect. In the picture below, point G is the centroid of triangle ABC.
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Centromere In this diagram of a duplicated chromosome, (2) identifies the centromere—the region that joins the two sister chromatids, or each half of the chromosome. In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers. The centromere is the part of a chromosome that links sister chromatids or a dyad. During mitosis, spindle fibers attach to the centromere via the kinetochore. Centromeres were first thought to be genetic loci that direct the behavior of chromosomes.
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- The difference between the aster of centrosome and chromosome is that the centrosome is a cell structure involved in the cell cycle that leads to cellular division. During th … e cell cycle, the cell grows and prepares itself to replicate chromosomes.E. êaking the world better, one answer at a time. Centromere is the 'waist' of a chromosome. The structure where mitotic spindles attach to the kinetochore while centrosome is an organelle where microtubules are formed in some cells. Centrosome contains a paired centriole.
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The sister chromatids in a chromosome are attached together by the? Best Answer: The centromere..... The centromere is a region, often found in the middle of the chromosome, involved in cell division and the control of gene expression. At this centromeric constriction the two mostly identical halves of the chromosome, the sister chromatids, are held together until late metaphase. During mitotic division, a transient structure called kinetochore is formed on top of the centromeres.
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Kinetochore The kinetochore /kɪˈnɛtəkɔər/ is the protein structure on chromatids where the spindle fibers attach during cell division to pull sister chromatids apart. The kinetochore forms in eukaryotes, assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.he kinetochore forms in eukaryotes, assembles on the centromere and links the chromosome to microtubule polymers from the mitotic spindle during mitosis and meiosis.
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Definitions &Translations centroid(noun) the center of mass of an object of uniform density. centroid(Noun) The point at the centre of any shape, sometimes called centre of area or centre of volume. For a triangle, the centroid is the point at which the medians intersect. The co-ordinates of the centroid are the average (arithmetic mean) of the co-ordinates of all the points of the shape.
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- Centromeres are crucial to segregation of the daughter chromatids during mitosis. View a second, third, and fourth fluorescence image of interphase. Illustrated in the fluorescence digital image above is a rat kangaroo (PtK2) kidney cell in the second gap (G(2)) period of interphase.
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Centroid Definition of Centroid. Centroid of a triangle is the point of intersection of all its three medians. The centre of mass of a uniform object is also called as Centroid.ues: Find the coordinates of the centroid of △XYZ with X (- 4, 2), Y (0, 5), and Z (3, - 1).
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Centromere In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers. The centromere (centro- + -mere) is the part of a chromosome that links sister chromatids. During mitosis, spindle fibers attach to the centromere via the kinetochore.Centromeres were first defined as genetic loci that direhromosomes.n a normal human karyotype, two chromosomes are considered metacentric: chromosomes 1 and 3. In some cases, a metacentric chromosome is formed by balanced translocation: the fusion of two acrocentric chromosomes to form one metacentric chromosome.
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Chapter 8 Biology Flashcards Centromere - the middle of a chromosome, what hold the chromatids together. Centrosome - the fibers at each of the poles in mitosis and meiosis. Centrioles - the pasta looking things at each pole in mitosis and meiosis.
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Centrosome The structure of the centrosome. The generalized structure and molecular components of a cell. In cell biology, the centrosome (Latin centrum 'center' + Greek sōma 'body') is an organelle that serves as the main microtubule organizing center (MTOC) of the animal cell as well as a regulator of cell-cycle progression. The centrosome is thought to have evolved only in the metazoan lineage of eukaryotic cells.
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Centromere (Redirected from Centromer). In this diagram of a duplicated chromosome, (2) identifies the centromere—the region that joins the two sister chromatids, or each half of the chromosome. In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers.The centromere (centro- + -mere) is the part of a chromosome that links sister chromatids.During mitosis, spindle fibers attach to the centromere via the kinetochore. Centromeres were first defined as genetic loci that direhromosomes.he centromere (centro- + -mere) is the part of a chromosome that links sister chromatids.