Question

base your answers to questions 76 and 77 on the information and diagram below and on your knowledge of biology. scientists attempted to determine the evolutionary relationships between three different finch species, a, b, and c. in order to do this, they examined the physical characteristics and dna of these species. dna was extracted from all three species and analyzed using gel electrophoresis. the results are shown in the diagram. 76. which statement best describes the method used above to determine the evolutionary relationships between three species of finches? (1) examine the structure of the beaks and compare them. (2) observe behavioral and physical characteristics of all the finches and group them by similarities. (3) obtain molecular evidence from all three species and identify similarities. (4) compare common ancestors of all three of the species to see if they are the same.

Explanation:

The problem is about determining evolutionary relationships of finch species using DNA (molecular evidence) via gel electrophoresis. Option (3) states obtaining molecular evidence from all three species and identifying similarities, which matches the method described (extracting and analyzing DNA). Option (1) focuses only on beak structure, option (2) on behavioral/physical (not molecular), and option (4) on common ancestors (not the method used here).

Answer:

(3) Obtain molecular evidence from all three species and identify similarities.