C. a Y chromosome from his father
This is because boys have one X and one Y chromosome, while girls have 2 X's, so the Y must come from the father.
Hope this helps :D
        
             
        
        
        
<span>They are the Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.</span>
        
                    
             
        
        
        
Answer: Option A) Yes, the 5th amino acid in the sequence has changed. 
Explanation:
Absolutely, the change of CCG to CAG does cause the amino acid Proline to be substituted by Glutamine.
Thus, the single base change of cytosine to adenine in CCG and CAG resulted in a different protein.