Directional selection tends to _____ (select all that apply).

Directional selection tends to _____ (select all that apply).
 
  a. eliminate extreme forms of a trait
  b. favor an extreme form of a trait
  c. eliminate intermediate forms of a trait
  d. favor intermediate forms of a trait
  e. shift allele frequencies in one direction

Question 2

Disruptive selection tends to _____ (select all that apply).
 
  a. eliminate extreme forms of a trait
  b. favor extreme forms of a trait
  c. eliminate intermediate forms of a trait
  d. favor intermediate forms of a trait
  e. shift allele frequencies in one direction