Zoology 10th Edition by Stephen Miller,John Harley

Exercise 6

Changes in the base sequence of DNA can be used in studying relationships among organisms. Genes that have changed little in evolution are said to have been conserved. Gene duplication can provide extra genetic material upon which evolution can act.
There are six subspecies of wild turkeys (Meleagris gallopavo) in North America. If one wanted to investigate evolutionary relationships among these subspecies, would it be better to use the cytochrome c gene or a non-protein-coding region of DNA? Explain.