Question

Provide evidence to reject this statement, "Human phenotypes are usually a clear cut either situation"

Answer 1

Wavy hair is a very easy example that this is false.  It's a merge between straight and curly hair.  Our traits tend to mix and blend together, it's not so simple.  Everybody isn't just tall or short, one or the other.  Everybody is a different height because it's a mid between your parents. 

Answer 2

The traits of father and mother are normally the characteristics found in offsprings for example ear lobes attached of free.