Alfred Sturtevant and Seymour Benzer's studies of recombination in both Drosophila and bacteriophage demonstrated which of the following?
A. The gene is an indivisible unit and recombination happens within the intergenic regions of chromosomes.
B. The distance among two genes is inversely proportional to the observed recombination frequency.
C. The location of recombination events is restricted to genes that are found at near chromosome centromeres.
D. The greater the distance among nucleotides, the greater the recombination frequency