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Pick of the week

Single-gene and chromosome disorders

To mark World Down Syndrome Day (21 March), this week’s pick explores conditions that have genetic causes. Some conditions can be caused by mutations in the DNA, while others are caused by larger changes in the chromosomes – such as Down’s syndrome, which is caused by an extra copy of chromosome 21.

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Fast Facts

Each issue of 'Big Picture' comes with a sprinkling of Fast Facts, fascinating snippets of information on the topic covered.

Browse through all of our Fast Facts indexed by topic