Because scientists find new information all the time, and this sometimes contradicts what we thought we knew. Of course we want to be as right as we can be at any given time, so the trees are revised based on the newfound facts.
No, because they do not identify individuals.
both cladograms and phylogenic trees
By DNA
Polygenic Traits
Polygenic trait
It is a polygenic character
POLYGENIC!
Polygenic Traits.
Traits that are produced by the interaction of several genes are called polygenic traits. Examples of polygenic traits are height and skin color.
Differencebetween polygenic and pleiotropic traits
Derived Characters Synapomorphies
cladograms