Short arm of a chromosome
The short arm of a human chromosome is symbolized by convention as "p". The "p" comes from the French "petit" meaning small. All human chromosomes have 2 arms, the p (short) arm and the q (long) arm. They are separated from each other only by a primary constriction, the centromere, the point at which the chromosome is attached to the spindle during cell division. The symbol "q" was chosen for the long arm simply because it followed "p" in the alphabet.

Medical dictionary. 2011.

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  • p arm of a chromosome — The short arm of a chromosome. The p comes from the French petit meaning small. All human chromosomes have 2 arms the p (short) arm and the q (long) arm that are separated from each other only by a primary constriction, the centromere, the point… …   Medical dictionary

  • q arm of a chromosome — The long arm of a chromosome. All human chromosomes have 2 arms a short arm and a long arm that are separated from each other only by the centromere, the point at which the chromosome is attached to the spindle during cell division. By… …   Medical dictionary

  • Long arm of a chromosome — The long arm of a chromosome is termed the q arm. All human chromosomes have 2 arms, the p (short) arm and the q (long) arm. They are separated from each other only by a primary constriction, the centromere, the point at which the chromosome is… …   Medical dictionary

  • Syndrome, chromosome 4 short-arm deletion — This syndrome, called the Wolf Hirschhorn syndrome, is a chromosome disorder due to partial deletion of the short (p) arm of chromosome 4. It is, therefore, also called the 4p syndrome. Features of the syndrome include midline defects with a… …   Medical dictionary

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  • Chromosome regions — Diagram of a duplicated and condensed (metaphase) eukaryotic chromosome. (1) Chromatid one of the two identical parts of the chromosome after S phase. (2) Centromere the point where the two chromatids touch, and where the microtubules attach. (3) …   Wikipedia

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