File:Chromosome- structure.jpg

From Embryology

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Chromosome Structure

DNA and histone proteins are packaged into structures called chromosomes. These chromosomes are only seen when the chromosome is folded for cell division.

Cells undergoing division have their DNA compacted into chromosomes with a short arm (p), a long arm (q), and a mid-section (centromere). The duplicated chromosomes are also joined together as pairs at the centromere.

  • p used to identify the chromosome short arm (possibly French, petit).
  • q used to identify the chromosome long arm (possibly French, tall), the next letter in alphabet after p

These letters prefixed by the chromosome number and followed by the chromosome band number, indicate gene location.

Cell Division Links: meiosis | mitosis | Lecture - Cell Division and Fertilization | spermatozoa | oocyte | fertilization | zygote | Genetics


Genetics Home Reference.


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Cite this page: Hill, M.A. (2024, April 13) Embryology Chromosome- structure.jpg. Retrieved from

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current22:23, 12 May 2010Thumbnail for version as of 22:23, 12 May 2010500 × 400 (88 KB)S8600021 (talk | contribs)==Chromosome structure== DNA and histone proteins are packaged into structures called chromosomes.