1. Welcome Back! 2/23/17
In a population of wooly beasts, individuals with long snouts tend to survive better on an island that has burrowing termites. Over time, the wooly beast population consists of individuals with extremely long snouts. This is an example of: A. stabilizing selection B. directional selection C. disruptive selection D. allopatric speciation
te/highschool.nsf/Survey.xsp

2. How do new species arise?

3. Speciation
The formation of new and distinct species in the course of evolution.
Occurs due to random mutations
Favorable mutations are passed on

4. Evolution Occurs in Patterns
Natural Selection Graphs
Stabilizing
Disruptive
Directional
Today: 1. Convergent v Divergent 2. Homologous v Analogous 3. Vestigial Structures

5. Convergent vs. Divergent
Convergent Evolution:
Describes evolution toward similar traits in unrelated species.

6. Divergent: describes evolution toward different traits in closely related species.

7. Homologous vs Analogous
Convergent evolution creates analogous structures
structures in different species having the same function but have evolved separately
do not share common ancestor

8. Homologous Structure
Very different animals have bones that appear very similar in form or function and seem to be related.

9. Two or more species can evolve together through coevolution

10. Cladograms- shows relationships between organisms

11. `