numerical taxonomy exercise

[kodos]

EXERCISE: express the similiarity between the isolated bacteria X and the ones cited for reference (1, 2, 3, 4) by means of a dendrogram.

SPECIES
TEST 1 2 3 4 X
a + - - + +
b + - + - +
c + - + + +
d - + + - -
e - + + - +

ATTEMPT: construct the first similarity matrix

1 2 3 4
1 100
2 0 100
3 40 60 100
4 80 20 20 100
5 80 20 60 60

DOUBT: do I have to choose between (1-4) and (1-5) to construct the first cluster and then go on? Or should I construct a (1-4-5) cluster instead?

[kodos]

Sorry, it came out awful, let's try again.

................................SPECIES
TEST..............1...........2..........3........ ..4.......X
a...................+............-......... -..........+......+
b...................+............-..........+..........-......+
c...................+............-..........+..........+......+
d...................-............+..........+..........-.......-
e...................-............+..........+..........-.......+

...........1.......2........3.......4
1........100
2..........0.....100
3.........40.....60.....100
4.........80.....20.......20....100
5.........80.....20.......60.....60