Which evidence least changes a phylogenetic tree?

Which type of evidence is least likely to result in changes to a phylogenetic tree?

A. DNA sequencing

B. Fossil record

C. Discovery of new species

D. Physical characteristics

Correct Answer: D. Physical characteristics

The type of evidence that is least likely to produce changes in a phylogenetic tree is physical characteristics.

Explanation:

Phylogenetic trees are constructed using different types of evidence, but their reliability varies.

1. DNA sequencing is a highly accurate type of evidence that gives reliable information on gene relationships. As new molecular evidence is available, changes in phylogenetic trees are seen.

2. Fossil records give information on ancestral or transitional species, which can produce changes in our understanding of evolutionary relationships.

3. The discovery of new species can add new taxa to a tree, thereby changing relationships based on new evidence.

Why are physical characteristics less likely to change phylogenetic trees?

1. Since physical characteristics are more prone to convergent evolution, unrelated species may end up having similar physical features.

2. Homoplasy is thereby created, as a result of which physical characteristics cannot be used to get accurate evolutionary relationships.

3. Compared to molecular evidence, physical characteristics are less reliable and sometimes misleading.

Conclusion:

The current studies on phylogenetic trees rely on molecular evidence because of its reliability. Physical characteristics are least likely to change a well-established phylogenetic tree.

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