Example A -- HARE ANSWERS
   The Affect of the Environment on Heredity  

   In rabbits, fur color varies in several types of H A R E S such as the  S N O W S H O E  
   H A R E  of North America.  In this species,
   (1)  in the W I N T E R, when the body temperature drops, this species is pure W H I T E (Fig. 7)

   (2)  In warmer T E M P E R A T U R E S ,  the species is pure  B R O W N  (Fig. 8)         
          The North American hare in Figure 9 shows both some snow and some grass in its
           surroundings.  Is this hare in its Summer or Winter coloration?   __ SUMMER __

    (3)   Even more striking is the study of the  H I M A L A Y A N     H A R E   from the mountains
            of Asia.  Like its American cousin, they change color, but this time from White to Black
           depending on the temperature in different parts of their body..   Surprisingly, it is the Black
           fur which grows in on the coldest parts of their body. 
    
           If a portion of the white back is shaved & an ice pack is placed there, new   B L A C K
           fur grows at that location.  

           I regret that my image searches on both Yahoo and Google did not turn up any photos
           of this Asian species in its winter coloration.  Such is life.  Here are a few other Himalayan
           Hare photos/sketches (10A, 10B, 10C, 10D) for your inspection.

     (4)  In several species of hares, the environmental variable that controls the fur color gene is 
           T E M P E R A T U R E

      And the winner is choice number one.  This diagram shows that the production of the black fur
      is due both to a gene for the production of the black pigment and cold temperatures.  Those areas
      of the hare that maintain body heat stay white.