試題詳解

44. Which of the following statements about genetic drift is TRUE?
(A) Genetic drift is significant in big populations.
(B) Genetic drift can cause allele frequencies to change at random.
(C) Genetic drift results in increased genetic variation within a population.
(D) In very big populations, genetic drift can also cause slightly harmful allele to become fixed.
(E) Genetic drift can preserve alleles in a population.