The Next Question(s) Refer to Table 20

Multiple Choice

The next question(s) refer to Table 20.1, which compares the % sequence homology of four different parts (two introns and two exons) of a gene that is found in five different eukaryotic species. Each part is numbered to indicate its distance from the promoter (for example, intron I is the one closest to the promoter) . The data reported for species A were obtained by comparing DNA from one member of species A to the DNA of another member of species A. Table 20.1
-Which of these four gene parts should allow the construction of the most accurate phylogenetic tree, assuming that this is the only part of the gene that has acted as a reliable molecular clock?

A) intron I
B) exon I
C) intron VI
D) exon V