Starr & Taggart – 11 th Edition Evolutionary Patterns, Rates, and Trends AP Biology: Chapter 19.
Evolution3
Speciation3
Cáceres 2009
The Origin of Species Chapter 22. The Nature of Species The concept of species must account for two phenomena: –The distinctiveness of species that occur.
BIOL2007 (B242) - BIODIVERSITY AND SPECIES Next lecture: how species evolve. Today: (1) nature of species (2) whether speciation differs from microevolution.
In past centuries, species were defined by apparent similarities to other known species– i.e., by morphological comparisons Similar organisms were grouped.
Speciation Formation of New Species. Formation of Species Formation of new species is called speciation.Formation of new species is called speciation.
BIOL2007 (B242) - BIODIVERSITY AND SPECIES Next lecture: how species evolve . Today:
Other Mechanisms of Isolation Changes in Chromosome Number Changes in Chromosome Number – Polyploidization can create barriers to gene flow that are not.
5 10 15 20 25 Types of Selection Hardy Weinberg Speciation Prezygotic vs. Postzygotic Grab Bag 5 10 15 20 25 5 10 15 20 25 5 10 15 20 25 5 10 15 20 25.
Chapter 18 Speciation. What is a Species? The morphological species concept expresses the following: – Species, in its simplest interpretation means “kind”
