There are between 4,000 and 6,000 diagnosed genetic disorders.
It is estimated that one in 25 children is affected by a genetic disorder and therefore 30,000 babies and children are newly diagnosed in the UK each year.
Some genetic disorders are apparent at birth while others are diagnosed at different stages throughout childhood, and sometimes into adulthood.
The money raised by organisations and schools on Jeans for Genes Day funds a range of initiatives that improve the quality of life of children and families affected by genetic disorders.
They run an annual grant programme that is open to all UK support groups and charities caring for children with genetic disorders.
They develop resources for schools to make pupils more aware and empathetic of the difficult lives that other children lead.
They fund Genetic Disorders UK, the national charity dedicated to supporting families affected by genetic disorders.