What does a phylogenetic trees with proportional branch lengths indicate?

Answer 1

The proportional branches of phylogenetic trees indicate the change of characters.

The evolution of these radiating branches in a phylogenetic tree indicates the number of shared characters. The phylogenetic trees show the ancestral history of related organisms. The radiating branches of the phylogenetic tree indicate a different line of evolution from the origina stock.

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Answer 2

Nicholas Ahn

The evolutionary distances between taxa are shown by phylogenetic trees with proportionate branch lengths.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.