 
      Change in mean population fitness ( ) under
            three models of Dominance of Fitness
) under
            three models of Dominance of Fitness
          
   
                    Dominance, Additive,
                and Recessive models
                proceed according to the General Selection Model.
              The three curves show
            the mean population fitness
            ( ) for
            the three models, as q
) for
            the three models, as q  1, where q
            is associated with the more fit phenotypes.
                1, where q
            is associated with the more fit phenotypes.
          
    The slope of the
            fitness curve is always positive, however the first
                derivative (d / dq)
                shows how the change
                in the slope varies as q
 / dq)
                shows how the change
                in the slope varies as q  1.
          In the dominance model,
                the slope is initially rapid and then decreases.
              In the additive model,
                    slope is constant.  In
            the recessive model,
            the slope is initially slow and then increases.
 1.
          In the dominance model,
                the slope is initially rapid and then decreases.
              In the additive model,
                    slope is constant.  In
            the recessive model,
            the slope is initially slow and then increases.
          
HOMEWORK: Observe
            that the dominant and
            recessive curves have
            the same shape, that is, if the green curve is
              flipped across the red curve, and flipped again along
            its length. Explain.