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Description:This illustration, courtesy of the National Human Genome Research Institute, depicts the karyotype that would represent the chromosomal configuration seen in a person with Down syndrome.
A karyotype represents a complete set of chromosomes in each and every eukaryote cell of an individual organism. The chromosomes are arranged in pairs, and aligned using the position of each chromosome’s centromere. Pairs are then arranged into groups “A” through “G”, based on size. In this particular case, the cells in a person with Down syndrome contain an extra chromosome 21 (arrow), and is therefore, known as “trisomy” 21.
High Resolution: Click here for hi-resolution image (4.38 MB)
Content Providers(s):National Human Genome Research Institute
Creation Date:2006
Photo Credit:National Human Genome Research Institute
Links:National Human Genome Research Institute Copyright Information
CDC – National Center on Birth Defects and Developmental Disabilities; Birth Defects; Down Syndrome
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.