Step 3. Construction of the phylogenetic tree Distance methods
... P = the fraction of sequence positions differing by a transition Q = the fraction of sequence positions differing by a transversion. ...
... P = the fraction of sequence positions differing by a transition Q = the fraction of sequence positions differing by a transversion. ...
Chapter 20 Questions
... Suppose that species 1 and species 3 have similar appearances but very divergent gene sequences. Species 2 and species 3 have very different appearances but similar gene sequences. Which pair of species is more likely to be closely related: 1 and 2, or 2 and 3? Explain. ...
... Suppose that species 1 and species 3 have similar appearances but very divergent gene sequences. Species 2 and species 3 have very different appearances but similar gene sequences. Which pair of species is more likely to be closely related: 1 and 2, or 2 and 3? Explain. ...
3000_2013_1e
... • when and how were complex eyes evolved? in what species are they lost? are the genes required to develop eyes still there? can they be expressed in different ways? ...
... • when and how were complex eyes evolved? in what species are they lost? are the genes required to develop eyes still there? can they be expressed in different ways? ...
tree
... • Can only work for pairs of sequences that are similar enough to be aligned • All base changes are considered equal • Insertion/deletions are generally given a larger weight than replacements (gap penalties). • Possible to correct for multiple substitutions at a single site, which is common in dist ...
... • Can only work for pairs of sequences that are similar enough to be aligned • All base changes are considered equal • Insertion/deletions are generally given a larger weight than replacements (gap penalties). • Possible to correct for multiple substitutions at a single site, which is common in dist ...