________ is demonstrated by the example that the heterozygote HbS ...

[sdfghj]

________ is demonstrated by the example that the heterozygote HbS HbA, one sickle-cell allele and one normal one, was maintained in some populations as the fittest phenotype for a malarial environment.
 
  A. Mutation
  B. Genetic drift
  C. Phenotypical adaptation
  D. Recombination
  E. Balanced polymorphism

Question 2

________ describes the process that allows the selection of certain traits of one sex because of advantages they confer in winning mates.
 
  A. Mitosis
  B. Genotype
  C. Directional selection
  D. Sexual selection
  E. Independent assortment

[lorealeza]

Answer to Question 1

E

Answer to Question 2

D

[sdfghj]

TYSM

[komodo7]

Thanks for the timely response, appreciate it