If a pure-breeding wired-hair terrier (WW) is crossed with a pure-breeding smooth-hair terrier ...

If a pure-breeding wired-hair terrier (WW) is
  crossed with a pure-breeding smooth-hair
  terrier (ww), and a puppy with a wavy hair is
  produced, the simplest explanation is
 
  a. a mutation.
  b. an X-linked gene.
  c. an incompletely dominant gene.
  d. a lethal gene.
  e. codominance

Question 2

In incomplete dominance,
 
  a. one allele is not dominant to another allele.
  b. the genotype can be determined by the
  phenotype.
  c. the heterozygote is somewhat intermediate
  to the two homozygotes.
  d. the intermediate phenotype may be the
  result of enzyme insufficiency.
  e. all of these are true.