Individuals who are ____ for sickle cell hemoglobin tend to be ____ resistant to falciparum malaria, ...

Individuals who are ____ for sickle cell hemoglobin tend to be ____ resistant to falciparum malaria, but do not
  experience the effects of sickled red blood cells.
  a. homozygous dominant; more
  b. homozygous dominant; less
  c. homozygous recessive; less
  d. heterozygous; more
  e. heterozygous; less

Question 2

Maternal PKU can result in serious effects in fetuses. This problem occurs because:a.
   the fetus is homozygous for PKU and therefore cannot metabolize phenylalanine.
  b. the fetus is usually homozygous dominant and therefore has PKU.
  c. the mother is heterozygous for PKU and therefore cannot metabolize phenylalanine.
  d. the mother is homozygous dominant for PKU and cannot metabolize phenylalanine.
  e. the mother is homozygous recessive for PKU and cannot metabolize phenylalanine.