Sickle cell disease exhibits a variety of symptoms and is more severe under stressful situations. ...

Sickle cell disease exhibits a variety of symptoms and is more severe under stressful situations. Sickle
  cell disease is an example of a _____ genetic disorder.
  A. discontinuous
  B. continuous
  C. polygenic
  D. multifactorial
  E. phenotypic

Question 2

Mendels experiments with pea plants yielded useful results because
  A. pea plants exhibit continuous variation.
  B. pea plants exhibit a variety of inheritance patterns.
  C. pea plants show discontinuous variation and complete dominance.
  D. pea plants are sterile.
  E. more than one of these are correct.