The phenotype of an organism

occurs only in dominant pure organisms.

represents its genetic composition.

cannot be seen.

reflects all the traits that are actually expressed.

The phenotype of about organism reflects all the traits that are actually expressed. It is not the genetic composition because phenotype is purely physical appearance. It can be seen because again it's the appearance. It also doesn't only occur in dominant pure organisms because recessive pure organisms still have a phenotype that is different. The phenotype shows the traits that get expressed because of the Punnett Squares