Oct 31 Bio Lecture Distinguishing Species
Causes of Homoplasy
- Convergent evolution causes similar morphological traits. Convergent evolution is when the same selection factors cause different species to develop similar traits.
- Similarities in DNA sequence due to parallel sequences or reversing mutations
- Compare ways of distinguishing species.
- Analyze how speciation occurs in terms of:
Species are evolutionarily independent populations.
Speciation is a splitting event because it makes populations evolutionarily isolated (genetically independent).
Biological species concept: criteria, advantages, disadvantages.
Morphospecies concept: criteria, advantages, disadvantages.
Phylogenetic Species Concept
Evolutionary history of species.
Monophyletic group: clade and all its ancestors.
Paraphyletic group: ancestor and some, but not all, descendants.
Allopatric: different place
Sympatric: same place