sential immunolo
Basic Immunology
P.Q.R and S are related species, X. Q. and R all evolved from species P.
An extinct species X, is a common ancestor of species Q and R.
Species Z is closely related to S and is a connecting link to other species. But Sis least
connnected to the other species,
The correct phylognetic tree which represents the above relationships is:
B.
0
S
S
R
ex
2
*R
Ix
*P
2
D.
S
o
2
X
R
10
P
TS
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