1. Bell Ringer
Objective: Describe examples of stabilizing, directional, and disruptive selection as a result of environmental conditions.
Question: POD page 36

2. Selective Forces
Use your textbook to define each of the selective forces.
Give a real world example (from book or create your own)
Illustrate graph of each type of force
X axis is number of individuals & y axis is the phenotype (physical trait)

3. What does this quote mean to you? How does it apply to Evolution?

4. Charles Darwin’s Theory of Evolution by Natural Selection
- Darwin was a ___________ who observed many species.
 He is famous for his trips to the ________________, his observations of the _________ (and other animals) and the book he wrote: “__________________________”:
1. ___________exists among _____________ in a species Individuals of species will _______ for resources (_____________) Some competition would lead to the ________ of some individuals while others would ___________ Individuals that had _____________ variations are more likely to survive and reproduce.
- This process he describes came to be known as ________________
- The favorable variations are called _______________
naturalist
Galapagos Islands
Finches
On the Origin of Species
Variation
individuals
competition
compete
death
survive
beneficial
Natural Selection
Adaptations

5. Title and Content Layout with SmartArt
Mechanisms of Evolution
1. ______________________ don’t evolve; ____________________ do. The population is the smallest unit of evolution because ________________________ traits in an individual cannot be passed on (inherited by offspring). However, different traits ________________________ present in a population can be “______________________”, changing the ______________________.
Title and Content Layout with SmartArt
Individuals
Populations
Acquired
already
Selected
Phenotype
2. Evolution occurs when the _________ ________ (all of the genes of a ________________) changes. A change in _____________ may lead to a change in ______________. Evolution acts on the ______________________.
Gene Pool
Population
Genotype
Phenotype
phenotype

6. 3. ____________________is the development of a new _________________
3. ____________________is the development of a new _________________. A species is defined as a group of organisms that can produce ___________________ offspring.
Speciation occurs when a population is ________________________, usually due to a ______________________ barrier, and natural selection changes the population so much the two groups could no longer ________________.
Therefore, ___________________ isolation leads to ___________________ isolation.
Speciation
species
fertile
isolated
geographical
interbred
Geographical
Reproductive

7. Stabilizing Selection
Stabilizing selection favors the “middle” phenotype in a population.

8. Directional Selection
Directional selection favors one of the extreme ends of the “typical” distribution.

9. Disruptive Selection
Disruptive Selection favors BOTH of the extreme ends of the “typical” distribution.

10. Amoeba Sisters Natural Selection and Bacterial Resistance
Watch the video and complete the worksheet that goes along. This means only ONE side of the worksheet.

11. Place the four pictures in the correct order and state why

12. Divergent (______________) Evolution: (also known as ___________ __________________)
_____________ species evolves into ___________ different species with distinct features ( Darwin’s finches)
Growing apart
Adaptive radiation
One
many

13. unrelated streamline Fins/flippers
Convergent (coming together) Evolution: Distantly related or ______________ organisms start to look alike or have the same features because the best fit organisms are surviving in the same environment.
Ex. A fish and a dolphin (mammal) are unrelated but they both have _______________ bodies and ___________ because they live in water
unrelated
streamline
Fins/flippers

14. Punctuated Equilibrium
Rates of Evolution
_____________________ is the slow change from one form to another.
___________________ __________________ implies long periods of stability without much change and short periods of rapid evolution. This can be due to mass climate changes .
Gradualism
Punctuated Equilibrium

15. Divergent and Convergent Evolution Practice