4 because the dominant alleles of the normal lady shadow the anemia.
        
             
        
        
        
B. Subgroups
<span>When constructing a dichotomous key, the first step is to look at the group of objects or organisms and separate them into two groups based on a single distinguishing characteristic.  Then continue to separate each of the groups until each object has its own separate set of characteristics.</span>
        
             
        
        
        
The answer is 
c
I hope it helps