please help. what do you guys think??? QUESTION 1 On a phylogenetic tree, what d

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please help. what do you guys think???

QUESTION 1 On a phylogenetic tree, what does the node at the base of two branches symbolize? o a. Common ancestor o b. Distant age O c. Shared derived characters o d. Mutation QUESTION 2 On a phylogenetic tree, the horizontal axis represents o a. diversity, time o b. time, diversity o c. ancestry,descent o d. tree, roots O e. descent, ancestry is represents

Explanation / Answer

a)In an evolutionary tree, a node represents a common ancestor of the descendants at the tip of the branch. B) the x-axis which is horizontal axis represents time, left side is oldest. As we move towards right side present day. Whereas vertical of y axis on a phylogenetic tree represents diversity separated from ancestors into each separate taxa. 4. c) A group of two or more branches joined at node is called as a monophyletic group or a clade. 5. a) According to hierchial nomenclature, It moves from general to specific : Kingdom> Phylum> Class> Order> Family> Genus>Species.   6. b) If two species share many common traits it is most likely that the common ancestor is relatively recent since the most common ancestor of all closely related organisms is last universal ancestor. 7. b) In convergent evolution two independent species share one common trait.

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