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This Scots edeetion wis shapit on 23rd Juin 2005. We hae 52,615 airticles the nou.
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Featurt airticle Featurt airticle


Diagram o a replicatit an condensed metaphase eukaryotic chromosome.

Chromosome is a DNA molecule wi pairt or aw o the genetic material (genome) o an organism. Maist eukaryotic chromosomes include packagin proteins that, aidit bi chaperone proteins, bind tae an condense the DNA molecule tae prevent it frae acomin an unmanageable tangle.

Chromosomes are normally veesible unner a licht microscope anerly whan the cell is unnergaein the metaphase o cell diveesion. Afore this happens, ivery chromosome is copied ance (S phase), an the copy is jyned tae the oreeginal bi a centromere, resultin aither in an X-shapit structur (picturt tae the richt) if the centromere is locatit in the middle o the chromosome or a twa-airm structur if the centromere is locatit near ane o the ends. The oreeginal chromosome an the copy are nou cried sister chromatids. In metaphase the X-shape structur is cried a metaphase chromosome. In this heichly condensed form chromosomes are easiest tae distinguish an study. In ainimal cells, chromosomes reach thair heichest compaction level in anaphase in segregation.

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A Haflinger foal

A Haflinger foal in Austrick

Eemage: Böhringer Friedrich

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The obverse o the Fields Medal
The obverse o the Fields Medal

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