DNA Differences Guide Evolutionary Relationships

The core concept is that organisms which evolved separately for longer periods (more distantly related) will exhibit a larger number of accumulated differences in their DNA sequences compared to closely related organisms.

Identifying the Correct Approach

The method based on comparing DNA differences to determine evolutionary relatedness is known as Molecular phylogeny.

• Molecular phylogeny utilizes molecular data, primarily DNA or protein sequences, to infer the evolutionary connections and history among species.
• The degree of sequence divergence acts as a measure of evolutionary distance, helping to estimate when species diverged from a common ancestor.

Evaluating Other Options

• The DNA study is a general term and lacks the specific focus on phylogenetic inference.
• The Morphological approach relies on comparing observable physical characteristics, which may not always accurately reflect genetic relatedness due to factors like convergent evolution.
• Metamorphosis is a biological process involving transformation during an organism's life cycle and is not a method for studying evolutionary relationships.

Therefore, Molecular phylogeny is the specific term for the approach described.