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  2. Chromosome 22 - Wikipedia

    en.wikipedia.org/wiki/Chromosome_22

    Chromosome 22 is the second smallest human chromosome, spanning about 51 million DNA base pairs and representing between 1.5 and 2% of the total DNA in cells. In 1999, researchers working on the Human Genome Project announced they had determined the sequence of base pairs that make up this chromosome. Chromosome 22 was the first human ...

  3. Chromosome regions - Wikipedia

    en.wikipedia.org/wiki/Chromosome_regions

    The largest regions on each chromosome are the short arm p and the long arm q, separated by a narrow region near the center called the centromere. [1] Other specific regions have also been defined, some of which are similarly found on every chromosome, while others are only present in certain chromosomes. Named regions include: Arms (p and q ...

  4. Philadelphia chromosome - Wikipedia

    en.wikipedia.org/wiki/Philadelphia_chromosome

    The result is that a fusion gene is created by juxtaposing the ABL1 gene on chromosome 9 (region q34) to a part of the BCR (breakpoint cluster region) gene on chromosome 22 (region q11). This is a reciprocal translocation, creating an elongated chromosome 9 (termed a derivative chromosome, or der 9 ), and a truncated chromosome 22 ( the ...

  5. Locus (genetics) - Wikipedia

    en.wikipedia.org/wiki/Locus_(genetics)

    In genetics, a locus (pl.: loci) is a specific, fixed position on a chromosome where a particular gene or genetic marker is located. [1] Each chromosome carries many genes, with each gene occupying a different position or locus; in humans, the total number of protein-coding genes in a complete haploid set of 23 chromosomes is estimated at ...

  6. Satellite chromosome - Wikipedia

    en.wikipedia.org/wiki/Satellite_chromosome

    With time, the term "SAT-chromosome" became an abbreviation for satellite chromosome. [6] [7] [8] The satellite at metaphase appears to be attached to the chromosomes by a thread of chromatin. SAT-chromosomes whose secondary constriction is associated with the formation of the nucleolus are referred to as nucleolar SAT-chromosomes.

  7. 22q11.2 duplication syndrome - Wikipedia

    en.wikipedia.org/wiki/22q11.2_duplication_syndrome

    These microduplications likely represent the predicted reciprocal rearrangements to the microdeletions characterized in the 22q11.2 region. [2] Smaller microduplications may occur within this highly dynamic with frequent rearrangements using alternative low-copy repeats as recombination substrates within and distal to the DiGeorge syndrome region.