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Chromatids in Medical News

Mitosis gets harder thanks to new gene discovery

...get. During the different phases of mitosis the pairs of chromosomes within the cell condense and attach to microtubule fibres that pull the sister chromatids to opposite sides of the cell. The cell then divides in cytokinesis, to produce two identical daughter cells. RASSF7 is the latest of a battery...
Chromatids in Medical Technology

In Rare Disorder, a Familiar Protein Disrupts Gene Function

...ns that form a ring that encircles chromosomes during cell division. Cohesin's long-established role, called "canonical" by the authors, is to control chromatids -- the long strands that chromosomes form when they copy their DNA. However, said Krantz, one open question in biology has been, "What does cohe...
Chromatids in Biological News

Is this the beginning of the end of plant breeding?

... along the centre of the cell. In mitosis, the two chromatids are pulled apartthe X is divided along one axis of...omes line up at the middle of the new cell and the chromatids divide at the centre of the X. Thus the differ...s two rounds of division; co-segregation of sister chromatids at the first division; and recombination that occu...

Centromeres cross over, a lot

...orescent probes. Using just one probe, only one chromatid would show a signal if no recombination had occurred. Instead, the authors found that both chromatids fluoresced. And not just at one pointon average, the authors counted, centromeres had undergone 15 recombination events. This is about six times the r...

Two central mysteries in genome inheritance solved at UCSD

...nce all chromosomes properly connect to the spindle, the pairs are separated and sisters are pulled towards opposite ends of the spindle. "If both chromatids of a chromosome, by chance, connect to a single end of the football-shaped spindle, the resulting daughter cells will lack the correct complement of g...

What controls stickiness of 'smart' chromosomal glue

...g cells do centromeric cohesins become cleaved. This precisely controlled centromeric "stickiness" is essential for the accurate segregation of sister chromatids into separate cells. "The key question we wanted to explore was how this step-wise loss of cohesins in meiosis was regulated," said Amon. "It coul...

Needling Chromosomes Reveals Cell Division Secret

... the cells are to divide properly. In this process chromatids are drawn apart to separate poles of the dividing ..., they attach independently, and often both sister chromatids can go to the same pole rather than to opposite po... when the "glue" protein called cohesin that holds chromatids was degraded during cell division. Also, microscop...
Chromatids in Biological Definition

Anaphase

...phase , by the end of which fully condensed sister chromatids are arranged in pairs, their centromeres lying alo...hesin , the protein responsible for holding sister chromatids together. They immediately separate, marking the c... distinct processes occur. During anaphase A the chromatids abruptly separate and move towards the spindle pol...

Chromatid

...") chromatids. After they have been pulled apart by the mitotic spindle , chromatids are called "chromosomes". Sister chromatids are joined at a point called the centromere . In non-gametic, non-dividing...

Chromosome

... phase . (2) Centromere . The point where the two chromatids touch, and where the microtubules attach. (3) Shor...pact transport form. Eventually, the two matching chromatids (condensed chromatin strands) become visible as a...he cell. During mitosis, the microtubules pull the chromatids apart, so that each daughter cell inherits one set...

Genetic recombination

...ter chromosomal replication , the four available chromatids are in tight formation with one another. During this time, homologous sites on two chromatids can mesh with one another, and may exchange geneti... chromatids; after crossing over, each of the four chromatids carries a unique set of genetic information. ...

Meiosis

...isappearance of spindles and spindle fibres as well as the uncoiling of the chromatids and the reformation of the nuclear membrane. Pinching of the cytoplasm or t...ase II , where the centromeres divide and the fibres pull the now separated chromatids (i.e. chromosomes) are pulled behind the centromere. The process ends wit...

Mitosis

...nfusingly) is called a chromosome. Just to be even more confusing, when the chromatids separate, they are no longer called chromatids, but are called chromosomes .... This is divided into two phases. First, the proteins that bind the sister chromatids together are cloven, allowing them to separate. They are pulled apart by th...

Mitotic spindle

...e center of the spindle. Once all the chromosomes are aligned with sister chromatids pointing to opposite ends of the spindle, the sister chromatids separate and are dragged away from each other, ensuring that each daughter...

Prophase

...h individual chromosome in the pair is called a chromatid , while the whole unit (confusingly) is called a chromosome. Somewhat confusingly, when the chromatids separate, they are no longer called chromatids, but are called chromosomes again. The task of mitosis is to assure that one copy of each sister chroma...

Mitosis

...nfusingly) is called a chromosome. Just to be even more confusing, when the chromatids separate, they are no longer called chromatids, but are called chromosomes .... This is divided into two phases. First, the proteins that bind the sister chromatids together are cloven, allowing them to separate. They are pulled apart by th...
Chromatids in Biological Dictionary

Sister Chromatids

Sister chromatids are identical copies of a chromosome connected by a centromere. Compare sister chromatids to homologous chromosomes, which are the two different copies of the same chromosome that diploid organisms (like humans) inherit, one from each parent. In other... Cohesin is th...

Telophase

...rophase. Metaphase. Anaphase. Telophase ... By telophase there are two separate groups of chromosomes at each pole. ... In telophase II the chromatids concentrate in the poles and the nuclear envelope ... The cells divide for the last time, leaving a total of four haploid cells, which ... Info...

Spindle Fibers

...hromosomes, overlap ... Mitosis, process in which a cell's nucleus replicates and divides in preparation ... The spindle fibers attach to the chromatids near the centromeres, and tug and ... muscle spindle n. A stretch receptor in vertebrate muscle. ... sensory fibers (Group Ia afferent neuron...

Sister chromatid

... Sister chromatids are identical copies of a chromosome connected by a centromere. Compare sister chromatids to homologous chromosomes, which are the two diffe...ed. ... However, the cohesion between sister chromatids is ultimately destroyed at the ... The dependency...

Prophase

...h stage of the prophase of meiosis ... How does prophase you differ from prophase II? ... During prophase the chromosomes are identical chromatids connected at the center ... The distinguishing feature of prophase is the setup of the mitotic spindle, ... ProPhase is a therapeutically focus...

Polytene

...division (endomitosis), forming a giant polytene chromosome. Polytene chromosomes form when multiple rounds of replication produce many sister chromatids that remain... most polytene (molecular biology) Having very large chromosomes with many strands ... Retrieved from "http://en.wiktionary.org ...

Nondisjunction

...ate properly during cell division. This could arise from a failure of homologous chromosomes to separate in meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. The result of this error is a cell with an imbalance of chromosomes. When a single chromosome is lost...

Meiosis

... process. In meiosis I, chromosomes in a diploid cell resegregate, producing four haploid daughter cells. ... Meiosis II separates the chromatids producing two daughter ... Exercise designed to help illustrate the events that occur in process of meiosis , which takes place to produce gametes...

Homologous recombination

... combination of genes in an ... During this time, homologous sites on two chromatids can mesh with one another, ... The biochemistry of eukaryotic homolog...ogous DNA molecules. ... During meiosis, two homologous pairs of sister chromatids ... ...

Diplotene

...omologous pairing ... diplotene ( ′diplō′tēn ) ( cell and molecular biology ) The stage of meiotic prophase during which pairs of nonsister chromatids of each bivalent Zoology information, history, articles and research from Academic Journals, Newspapers, and magazines at HighBeam.com. Free Trial,...
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