Duchenne muscular dystrophy - normal female, chromosomes have been highlighted by a fluorescent probe for exon 45/47 (note the double yellow band). This disorder is caused by a recessive gene on the X chromosome, so is normally shown only by males, who lack a second X chromosome. The condition starts with difficulty in walking and climbing stairs in early childhood, usually resulting in confinement to a wheelchair by the age of 10, with death from respiratory infection or cardiac failure by about the age of 20.

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Duchenne muscular dystrophy - normal female, chromosomes have been highlighted by a fluorescent probe for exon 45/47 (note the double yellow band). This disorder is caused by a recessive gene on the X chromosome, so is normally shown only by males, who lack a second X chromosome. The condition starts with difficulty in walking and climbing stairs in early childhood, usually resulting in confinement to a wheelchair by the age of 10, with death from respiratory infection or cardiac failure by about the age of 20. Wessex Reg. Genetics Centre. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.