Lets say he has the genetic type.  What is the chance that his daughter will get the gene?  How about his son?   There is a 50% chance that each child has inherited it from their father.

Which muscle fibers are affected with aging?   Type II muscle fibers are also affected with the muscle loss of aging.

What about zone 1 and zone 3?   Zone 1 typically only has sensory and motor involvement and zone 3 typically only has sensory involvement.  Refer to the above link for locations of the different zones.

What part of the spinal cord does Polio typically affect?   The virus usually replicates in the anterior horn cells damaging the motor neurons at this location.