A microdeletion on 13q9.7 is associated with increased risk of intellectual disability, seizures, autism spectrum disorders, and schizophrenia. A recent study showed
that penetrance for having at least one of these symptoms, assuming an average life span, is 29%.
A 5 year old girl has recently been experiencing seizures, this deletion was detected in her, as well as her mother, but not her father and it was concluded to be the
cause. What are the chances that her younger brother will experience one of the above symptoms in his life, assuming he lives to an old age?
Answer:
