Question

1. what modern method of study can trace the evolutionary relatedness of organisms by comparing the nucleotide sequences on dna?

a. phylogeny
b. molecular clocks
c. cladograms
d. classification

Explanation:

To solve this, we analyze each option:

• Option A: Phylogeny is the study of evolutionary relationships, but the method here is about comparing DNA nucleotide sequences.
• Option B: Molecular clocks use the rate of molecular change (like in DNA) to estimate time of divergence and trace evolutionary relatedness by comparing nucleotide sequences.
• Option C: Cladograms are diagrams showing relationships, not a method of comparing DNA sequences.
• Option D: Classification is organizing organisms into groups, not about comparing DNA for relatedness.

So the correct method is molecular clocks.

Answer:

B. Molecular clocks