BISC 102 Chapter Notes - Chapter 26: Dusky Seaside Sparrow, Phylogenetic Tree, Species

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 102
• Professor: Isabelle Cote

Document Summary

Speciaion occurs when populaions of the same species become geneically isolated by lack of gene low and then diverges from each other due to selecion, geneic drit or mutaion. Populaion can be recognized as disinct species if they are reproducively isolated from each other, if they have disinct morphological characterisics, if they exploit diferent sets of resources, or if hey form independent branches on a phylogeneic tree. Populaions can become geneically isolated from each other if they have disinct morphological characterisics, if they exploit diferent sets of resources, or if they form independent branches on a phylogeneic tree. Populaions can become geneically isolated from each other if they use diferent habitats or resources within the same area, or if 1 populaion is polyploidy and can"t breed with the other. When populaions that have diverged come back into contact, they may fuse, coninue to diverge, stay parially difereniated or have ofspring that form a new species.