In order: 50% 0% 100%? 50% 
you have a 50% chance of having healthy offspring b/c they do not possess the gene 
0% b/c they all carry the disease 
100% b/c all of them have the recessive gene 
50% b/c there’s only two that are completely recessive (aa)
        
             
        
        
        
Answer:
Nothing
Explanation:
They have no common attributes
 
        
             
        
        
        
The answer is nucleotides
        
             
        
        
        
Directional selection acts against b<span>oth extremes simultaneously in the variation of the trait. This is the most "aggressive" form of selection and only happens in extreme areas. 
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Answer:
in an athlete that os blood doping there wooed be more oxygen absorbed-by the read blood cells and will get less