phylogentic tree constuction

Question

[sayyarsehrish]

can i draw phlogentic tree in neighbour joining method without using an outgroup? does outgroup have any effect on my tree if i dont use outgroup?

Answer 1

[mdsiddra]

1) Yes, you may draw your tree without using an outgroup.

2) In any phylogenetic tree, outgroup is the one which is more distantly related group of organisms that can serve as a reference group in order to determine where in the evolutionary history ingroups stand. Now you may understand what effect does an outgroupo bring to phylogenetic tree.