File:Trisomy21male.jpg
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Trisomy 21 (Down Syndrome) (male) karyotype
Down syndrome or trisomy 21 is caused by nondisjunction of chromosome 21 in a parent who is chromosomally normal and is one of the most common chromosomal abnormalities in liveborn children. The frequency of trisomy 21 in the population is approximately 1 in 650 to 1,000 live births, in Australia between 1991-97 there were 2,358 Trisomy 21 (Down) infants.
The normal human karyotypes contain 22 pairs of autosomal chromosomes and one pair of sex chromosomes. The karyotype is the characteristic chromosome complement as identified by staining and can only be identified during cell division when chromosomes are folded. The chromosomes when organised as an image in sequence are called a karyogram or idiogram.
Image Source: UNSW Embryology http://embryology.med.unsw.edu.au/Defect/page21.htm
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:19, 27 July 2009 | 480 × 284 (10 KB) | MarkHill (talk | contribs) | Down syndrome or trisomy 21 is caused by nondisjunction of chromosome 21 in a parent who is chromosomally normal and is one of the most common chromosomal abnormalities in liveborn children. The frequency of trisomy 21 in the population is approximately 1 |
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File usage
The following 18 pages use this file:
- 2009 Lecture 2
- 2010 BGD Practical 12 - Abnormalities
- 2010 Lecture 1
- 2010 Lecture 2
- 2011 Lab 12 - Abnormalities
- ANAT2341 Lab 12 - Abnormalities
- Abnormal Development - Genetic
- BGDA Practical 12 - Abnormalities
- Foundations Practical - Critical Periods
- Genetic risk maternal age
- Historic Embryology Vignette
- Lecture - 2011 Course Introduction
- Lecture - 2012 Course Introduction
- Lecture - 2013 Course Introduction
- Lecture - Fertilization
- Trisomy 21
- Talk:2010 BGD Tutorial - Applied Embryology and Teratology
- Template:Trisomy 21 Vignette