B: Species 3: Val-Gly-Thr-Ser-Tyr-Pro
This species has the same first four amino acids in the active site as humans (Val-Gly-Thr-Ser) and only differs by one amino acid (Tyr instead of Cys) which is a conservative substitution. The other species have more differences in their active site sequence.
An amino acid analysis of the DNA polymerase gene in humans determines that the sequence of the active site is: Val-Gly-Thr-Ser-Cys-Pro. Based on this information, which species below would be considered the most evolutionarily related to humans?
A: Species 1: Gly-Leu-Ser-Thr-Cys-Pro
B: Species 3: Val-Gly-Thr-Ser-Tyr-Pro
C: Species 2: Val-Gly-Phe-Tyr-Asn-Pro
D: Species 4: Leu-Val-Met-Thr-Tyr-Pro
1 answer