Building Phylogenetic Trees Can Be Challenging When Horizontal Transfer Has

question 25

Multiple Choice

Building phylogenetic trees can be challenging when horizontal transfer has occurred in bacteria. Why?

• A) Trees cannot be accurately rooted when horizontal transfer has occurred
• B) Virulent isolates evolve too rapidly to be captured in a phylogenetic tree
• C) Lineages of bacteria from different locations are unrelated if horizontal transfer has occurred
• D) Genetic differences between organisms are usually assumed to have occurred in a stepwise fashion

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