BIO152H5 Study Guide - Species, Monophyly, Allele Frequency
Document Summary
Species concept: can they breed and produce viable offspring? (good example: mule: can"t reproduce) Monophyletic group: contains a common ancestor and all its descendants. People thought they were different species because of their characteristics. Atlantic coast had a grp of subspecies and the gulf coast had a grp of subspecies. Looking at dna will tell us if they are genetically separate or similar. 4 ways evolution can occur:all they do is cause allele frequencies to change. Natural selection happens to better fit the environment, not necessarily the case with the other 3 processes. Allopatric speciation (26. 5): happens via dispersal or vicariance: dispersal: traveling to different land, vicariance: when it isolates populations due to environmental processes (ie. river changes course) Ratites can"t fly, and due to continental drift they spread to different parts of the earth. Differences would have been extended by natural selection as environments changed on each plate (fig.
