Читать книгу Principles of Microbial Diversity - James W. Brown - Страница 71

1 1. Which organism would you choose for an outgroup for an rRNA tree of mammals? Does it matter which nonmammal you choose? Why? What might you choose as an outgroup for an rRNA tree of Bacteria? What about for a “universal tree” containing sequences of all kinds of organisms?

2 2. What would a tree of some animals look like if constructed from globin genes where some of the sequences were alpha globins and others were beta globins? What if some of these were adult alpha or beta globins and others were juvenile or fetal globins?

3 3. What would a tree (no pun intended) of plants look like if some of the sequences (rRNAs) were accidentally taken from the chloroplast instead of the nucleus? What if all of the sequences were from the chloroplasts?

4 4. On the initial “phylum-scale” representative tree of Bacteria shown above, can you show where we might have hoped ES-2 would be?

5 5. Which properties can you predict for ES-2 based on its phylotype? Which properties can you not predict?