Question $4$: Phylogenetic trees $(20$ points$)$

$($for additional practice, see the Practicing Phylogenetics section from the Phylogeny

lecture$)$

Using the above phylogenetic tree to answer the following questions

What is the most recent common ancestor of the Amazon molly and the Zebrafish?

Circle the ancestor and mark it with an $$A$$

What is the most recent common ancestor of the Rainbow trout and European Eel?

Circle the ancestor and mark it with an $$B$$

Who is more closely related to the Common carp: the Green Spotted Puffer or the

Electric Eel?

What is more closely related to the Atlantic Salmon: the Atlantic Cod or Southern

Platyfish?

Rubric: To get full points you must

$$ Identify the common ancestor of two species$/$strain on the tree $(5$ points each$)$

$$ Determine the relationship between $2$ organisms on the tree and a third organism,

i$.$e$.$ who is more closely related $(5$ points each$)$

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$\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Question $5$: Community interactions $(15$ points$)$