Question

What change is observed in a distribution curve for a trait affected by directional selection?(1 point)
Responses

A. It shifts to the right and to the left. 
It shifts to the right and to the left. 

B. It shifts to the right. 
It shifts to the right. 

C. It shifts to the left. 
It shifts to the left. 

D. It shifts either to the right or to the left. 

Answer 1

D. It shifts either to the right or to the left.