Sister Chromatids

sister chromatids
(kroh-muh-tidz)
Replicated forms of a chromosome joined together by the centromere and eventually separated during mitosis or meiosis II.
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sister chromatids Chromatids joined by a common centromere and carrying identical genetic information (unless crossing-over has occurred). PICTURE ...
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How do nonsister chromatids ensure that crossing over between them will occur without the loss or gain of a single nucleotide? One plausible mechanism for which there is considerable laboratory evidence postulates the following events.
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Anaphase
the sister chromatids separates and chromosomes pull apart
identical copies are pulled part to each side of the cell by the spindle fibers ...
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The chiasmata are thought to be the points where two nonsister chromatids exchange genetic material during chromosomal crossover during meiosis (sister chromatids also form chiasmata between each other, ...
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In the, second division (meiosis II), sister chromatids segregate.
In the segregation of chromosomes to daughter cells, the chromosomes appear to be pulled via a structure attached to chromosome centromeres.
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Anaphase is preceded by metaphase, by the end of which fully condensed sister chromatids are arranged in pairs, their centromeres lying along a surface known as the metaphase plate.
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: Constricted region where sister chromatids are attached in mitotic chromosomes. The centromere is generally flanked by repetitive DNA sequences and it is late to replicate. The centromere is an A-T region of about 130 bp.
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The stage of meiosis and mitosis in which sister chromatids (meiosisII) or homologous chromosomes (mitosis and meiosisI) are separated by spindle fibers.
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crossing over between sister chromatids either on the same or on homologous chromosomes
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
What Topic Is Your BIOLOGY Paper On?
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A cross-over between strands of two non-sister chromatids during recombination. The junction where two homologous chromosomes appear to exchange genetic material during recombination. (Chi is the greek letter c which resembles a genetic cross-over.) ...
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sister chromatid One of the two identical parts of a duplicated chromosome in a eukaryotic cell. Sister chromatids consist of exact copies of a long coiled DNA molecule with associated proteins.
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- Chromosome
- Daughter Cell
- Sister Chromatids
Definition: Chromosome resulting from the separation of sister chromatids.
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Centromere the central region of a chromosome which holds the sister chromatids together
(centro = center; mer = part)
Cerebellum the wrinkled-looking posterior part of the brain
(cereb = the brain; -elle = small) ...
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crossing over
the reciprocal exchange of genetic material between non-sister chromatids during synapsis of meiosis I.
Crustacea
class in the phylum Arthropoda. Most members of this class are aquatic, although a few are terrestrial.
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Centromere: A specialized constricted region of a chromosome to which spindle fibers attach during cell division at which two sister chromatids (the two exact copies of each chromosome that are formed after replication) are joined, ...
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The constricted region near the center of a human chromosome. This is the region of the chromosome where the two sister chromatids are joined to one another.
explained:
Listen to a detailed explanation.
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kinetochore: a region of DNA that has remained undivided during prophase of mitosis; binds to the spindle fibers that eventually pull apart the sister chromatids.
kingdom: the largest and broadest category of the classification system.
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Next, the sister chromatids are separated from each other (the second meiotic division). Finally, the separated sets of chromosomes (a haploid set) are wrapped up in spores.
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