Answers:
Not all people with autism have fragile X..especially the females! In any case, with autism, there are very few common features (physical) although there are some common symptomologies and behaviors.
Fragile X does however have some common physical features. Many fragile X children have digestive issues from a young age. Enlarged testes is another . I have no read anything on how this effects fertility since very few children with fragile X would choose to father children...it is a genetic based illness and as such, would have the potential of being passed on to any male children the person may have. The testes tend to be enlarged from ayoung age and are often one of the markers physicians look for in diagnosising fragile x.
I do not believe there is a high prevalence of Fragile X syndrome with children who have Autism Spectrum Disorder.
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