The probability of transmitting both traits to his son is Zero. This is because the son has one X chromosome and one Y chromosome (XX), therefore since the traits are linked to the X chromosomes, it means the son will only be a carrier but will not show the trait phenotypically. 
        
             
        
        
        
Hopefully this will help and it's what you are looking for.
 
        
        
        
Ventilation is the act of moving/pushing air into and out of the lungs.
        
             
        
        
        
I want to say its a recessive trait