Question

III. Answer the quest a 1. a. Use the lined up homologous DNA base sequences below to determine the mutations required to reconstruct the phylogeny of Taxa R, S & T (see answer sheet). DNA sites 1 2 3 4 a. Label the tree with the appropriate mutations using hash marks, 2 pts. Ancestor AACG b. Why is this the best phylogeny of the 3 taxa? I pt. Taxon R GCTG c. Which two taxa form a monophyletic group? 1 pt. Taxon S GACG d. Which two taxa form a paraphyletic group? I pt. Taxon T GCTA e. Which is the basal taxon? I pt.

Answer 1

Qn a.

Taxons 1. Taxon R TaxonT * GETA XrGeTG X [GACG Ge (AA CG](Ancestor)

Qn b.

This is the best phylogenetic tree for this three taxa because genetic sequences are used to construct the tree. Share derived characteristics used to group taxons.

Qn c.

Taxon R and Taxon T form a monophyletic group. Monophyletic groups have all descendants from a common ancestors .

Qn d.

Taxon S and Taxon R form a Paraphyletic group. Paraphyletic group includes ancestor and some but not all of its defendants .

Qn e.

Basal taxon is the lineage that diverge early in the history of a group or clade and has no other branch point.

A Monophylatie To group Paraphylatic Taxon R) Taxons group eta Basal - Taxon . _* [GACS] AA CG] (Ancestor)