File:Trisomy 21 newborn.jpg

From Embryology

Trisomy_21_newborn.jpg(320 × 240 pixels, file size: 16 KB, MIME type: image/jpeg)

Trisomy 21 (Down Syndrome) Newborn

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.


Links: Trisomy 21


Image Source

CDC Dr. Godfrey P. Oakley http://phil.cdc.gov/phil_images/20021209/4/PHIL_2634_lores.jpg

Description: This photograph depicts a newborn with the genetic disorder Down Syndrome, due to the presence of an extra 21st chromosome. The estimated incidence of Down Syndrome is between 1:1,000 to 1:1,100 live births. Each year approximately 3,000 to 5,000 children are born with this chromosomal disorder.

High Resolution: Right click here and select "Save Target As..." for hi-resolution image (18.89 MB)

Content Providers(s): CDC/ Dr. Godfrey P. Oakley

Creation Date: 1974


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current14:37, 5 August 2009Thumbnail for version as of 14:37, 5 August 2009320 × 240 (16 KB)S8600021 (talk | contribs)Trisomy 21 (Down Syndrome) Newborn 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 trisom

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