Take the Jukes-Cantor distances you computed and write a program that
computes a UPGMA tree for them. The algorithm for this will be found in
Lecture 3 of this quarter, and on pages 166-167 of Durbin et. al.
You need only print out the tree as a series of statements about which
lineages cluster with which, and how far back from the present (measured
in terms of distance).