you will find
a data matrix
(with six species scored for nucleotides at 9
and four alternative trees. F
or each character
, calculate the
number of steps needed to account for its evolution on each of the four trees
using the chart
Sum across the characters to determine the overall tree length.
Which of the four trees is the most parsimonious
and how many steps (nucleotide changes) are required?
CharacterSpecies237894ABACAEGFGTotalLengthSteps on tree 1Steps on tree 2Steps on tree 3Steps on tree 4ABCDTree 1Tree 2CFEATree 3Tree 4