Despite being labelled as 'rare', Noonan Syndrome is estimated to affect between 1 in 2000 to 1 in 2500 births in the UK (the exact prevalence is unknown due to many people remaining undiagnosed). For ...

Down syndrome, or trisomy 21, is caused by the presence of a third copy of the 21st chromosome. Affected individuals have inherited two copies of chromosome 21 from one parent and one copy from ...