What is a Transitional Form?
  Suppose that we have the following two creatures, one of which is the ancestor of the other:  
 
Ancestor
Descendent
  
 
 
  How would evolution work to create the descendent?      
 
possibility 1: gradual change from one to the other
      
 

possibility 2: a series of mutations over many generations

Each mutation changes the appearance of the organism in particular ways. Click on the different traits (below, left) to show what the organism looks like after this mutation has occurred.

      
forehead        
eye shape        
mouth        
length        
legs        
teeth        
tail        
neck        
spines        
color        
eye color