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.
- Trisomy 21 Links: Trisomy 21 | Image T21 female karyotype | Image T21 male karyotype | chromosome 21 | Category:Trisomy 21 | Genetic Abnormalities | Prenatal Diagnosis
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
Reference
UNSW Embryology
Cite this page: Hill, M.A. (2024, June 8) Embryology Trisomy21male.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Trisomy21male.jpg
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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- 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