1. Evolution of populations
Big Q: What are the sources of genetic variation?
Big Q: What is genetic drift?
Big Q: What types of isolation lead to the formation of new species?

2. Engage- Mimicry
Watch the video clip on mimicry and write down the main idea.
How does mimicry help a species survive?

3. Explain - Genetics in Evolution
Gene Pool - all the alleles that are present in a population
Allele Frequency - the number of times an allele occurs in the gene pool
Evolution in a genetic sense involves a change in allele frequency in the gene pool

4. Elaborate - Genetic Drift
Genetic Drift - random change in allele frequency
Two types:
1. Bottleneck Effect - change in allele frequency following a dramatic reduction in population size
2. Founder Effect - allele frequencies change as a result of the migration of a small subgroup of population

5. Elaborate- genetic Equilibrium
Genetic Equilibrium - when evolution does not occur due to no changes of allele frequency in the gene pool
Hardy Weinberg Principle - calculates the possibilities for changes in a population by predicting:
1. Nonrandom Mating - sexual selection of mates based on traits
2. Small Populations - genetic drift
3. Emigration or Immigration - changing genes in the gene pool
4. Mutations - introduce new genes
5. Natural Selection - changing the fitness

6. Explain - Speciation Speciation - forming a new species
This is caused by isolation:
1. Reproductive Isolation - species cannot interbreed
2. Behavioral Isolation - courtship ritual differences
3. Geographic Isolation - separation by geographic barriers
4. Temporal Isolation - two or more species reproduce at one time

7. Elaborate - Darwin’s Finches
Called adaptive radiation
Changes in the gene pool and types of isolation led to speciation across the Galapagos

8. Explain - Dating Earth’s History
Fossils - preserved remains of ancient life commonly found in sedimentary rocks
Index Fossil - distinctive fossils used to compare rock age for relative dating
Radioactive Dating - uses radioactive isotopes to identify remains based on an element’s half-life

9. EXplain - rate of Evolution
Gradualism - evolution occurs at a slow and steady pace
Punctuated Equilibrium - evolution is interrupted by brief periods of rapid change

10. Elaborate - Types of Evolution
Convergent Evolution - production of distantly related organisms with similar structures and characteristics
Coevolution - two species evolve in response to changes in each other over time

11. Evaluate - Genes
Complete your exit ticket