Some scientists believe that a man-made mass extinction may occur in the coming years. Just to let you know.

Would this be considered allopatric or sympatric separation?

An example of a small phylogenetic tree

Speciation

• Speciation refers to the origin of new species
• A species is defined as group of members who have the potential to breed & create viable offspring.
• Reproductive isolation is the existence of barriers that prevent 2 species producing viable offspring.
• Allopatric refers to geographic separation while sympatric is when species still live in same area
• There are many types of isolation that organisms encounter: geographic, ecological, temporal, behavioral, mechanical and gametic ​

Phylogenetics

• All of life is related through one common ancestor and phylogeny is the evolutionary history of these relationships
• A phylogenetic tree is a diagram made to showcase this history.
• To read a phylogenetic tree one must understand a few terms:
• Lineage: An ancestor and its descendant populations. These are represented as a line drawn on a time axis
• Node: Is when a single lineage divides into 2 separate lines. On a phylogenetic tree, these are depicted as a split.
• Root: Is the common ancestor to all the organisms in the tree. It is always the oldest organism from the graph and the farthest from present day species.