Hereditary is Breast cancer and Inheritance is 
Getting Breast Cancer basically it runs in the family inheriting.
        
                    
             
        
        
        
I believe it is a Pure Substance
        
             
        
        
        
I don't like using W instead we can try to use R 'kay? 
R - Dominant
r - Recessive 
75% chance that they will have widows peakline children. 25% chance for straight hairline