File:Human idiogram-chromosome 21.jpg: Difference between revisions
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:'''Links:''' [[:File:Human idiogram-chromosome 21.jpg|chromosome 21 idiogram]] | | :'''Links:''' [[:File:Human idiogram-chromosome 21.jpg|chromosome 21 idiogram]] | [[Trisomy 21]] | [[:File:Trisomy21female.jpg|Image - T21 female karyotype]] | [[:File:Trisomy21male.jpg|Image - T21 male karyotype]] | [http://www.ncbi.nlm.nih.gov/mapview/maps.cgi?taxid=9606&chr=21 Genome View - chromosome 21] | ||
===Chromosome 21=== | ===Chromosome 21=== |
Revision as of 09:08, 3 June 2013
Human Idiogram - Chromosome 21
Idiogram (karyogram) - A drawing or photograph of the chromosomes of a particular cell.
- Links: chromosome 21 idiogram | Trisomy 21 | Image - T21 female karyotype | Image - T21 male karyotype | Genome View - chromosome 21
Chromosome 21
- the smallest human chromosome
- about 47 million base pair
- about 1.5 % of the total DNA in cells
- contains between 300 and 400 genes (of human estimated 20,000 to 25,000 total genes)
- trisomy 21 or Downs Syndrome - additional copy of this chromosome
- partial monosomy 21 - missing segment of the chromosome in each cell
- ring chromosome 21 - circular structure, occurs when there are two breaks in a chromosome and the ends of the chromosome then fuse together
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Idiogram Chromosome Banding - The term refers to the light and dark pattern, seen after staining with a dye, of individual chromosomes identified in metaphase. It is only in meiosis and mitosis during metaphase that chromosomes can be easily identified, during the normal cell life (interphase) the chromosomes are unravelled and distributed within the nucleus in chromosome territories. A band is that part of a chromosome which is clearly distinguishable from nearby regions by appearing darker or brighter with one or more banding techniques. | |
Genetic abnormality locations: 1-4 | 5-8 | 9-12 | 13-16 | 17-20 | 21-XY | sSMC | |
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Links: Genetics | Abnormal Development - Genetic |
Cite this page: Hill, M.A. (2024, March 29) Embryology Human idiogram-chromosome 21.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Human_idiogram-chromosome_21.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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current | 14:51, 23 April 2011 | 31 × 142 (2 KB) | S8600021 (talk | contribs) | ==Human Idiogram - Chromosome 21== Idiogram- A drawing or photograph of the chromosomes of a particular cell. This drawing does not include the mitochondrial DNA. {{Human chromosomes}} Category:Genetics Category:Chromosome [[Category:Molecula |
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