Burdett DNA Project using 67 markers and creating nodes to connect nodes of genetic distance 3.

Although the three unique sets of DNA markers in groups 1a and 1b are distances 2, 3, and 3 from each other, a hypothetical ancestor at t7 would be distances 1, 1, and 2 from the descendants. If the ancestor is t7, three branches changed independently indifferent ways. If the ancestor is t1 or t2, one descendant branch split to 73417, and another to t7, which later branched into 77434 and 73544.