Answer:
Hope the above picture might help you :)
 
        
                    
             
        
        
        
<h2>Answer:</h2>
Because same base pairs are arranged differently among organisms due to which there are so much variations in organisms. 
<h3>Explanation:</h3>
- Variation in the organism is due to the genes.
- Every one have different DNA/genes which describes one's features.
- Genes are various arrangements of these four base pairs.
So same base pairs with different pattern arrangement causes variation among organism.
 
        
        
        
Roan fur in cattle, in which white and red hair is equally expressed.