Which human chromosome is linked to Down syndrome?
Quick Answer
Chromosome 21 is linked to Down syndrome. The condition is usually caused by an extra copy of chromosome 21, called trisomy 21.
The Full Story
Down syndrome is most commonly caused by trisomy 21, meaning a person has three copies of chromosome 21 instead of two. This extra genetic material affects development and can lead to characteristic physical features, intellectual disability, and a higher risk of certain health conditions. The syndrome was named after physician John Langdon Down, who described it in 1866. Modern prenatal screening can detect the condition, and medical care has greatly improved life expectancy.
Key Facts
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