1. Due Pass to the middle. Intervention Signatures Darwin vs. Lamarck
In 30 Seconds they will be late.

2. Chapter 15-1: Charles Darwin Evolution and Natural Selection
Warm up 2/4: Make a 2 columns and place the following according to whether they describe Lamarck or Darwin.
Place In Two Columns!
Working out will make your offspring stronger. If you are strong your offspring might be stronger.
The traits that animals desire have nothing to do with how a species adapts and evolves.
Survival of the Fittest.
Acquired Characteristics.
Organisms adapt to the environment through individual change.
Organism adapt to the environment because only those with the correct genes survive to reproduce.
Chapter 15-1: Charles Darwin
Evolution and Natural Selection

3. Ideas Before Darwin
Most people believed that earth was thousands of years old and organisms did not change.
Fossils showed that very different organisms lived in the past.
Jean Baptiste Lamarck proposed the idea of acquired traits to explain the changes.
Traits used most often would be enhanced and passed to offspring
Traits that were not used would diminish and disappear from offspring

4. Charles Darwin
After traveling the world by ship (H.M.S. Beagle) he published The Origin of Species (1858)
Two Goals
Present evidence that evolution occurs
Explain the variety and distribution of organisms on earth

5. Darwin’s Ideas Descent with Modification
Darwin’s idea that small changes accumulate over generations.
Suggests that all species are descendants from a few kinds of life.
Darwin’s Finches – 13 finch species that evidence suggests descended from one original species from Ecuador
Population: the number of a specific species living in a specific place at a specific time

6. Natural Selection
4) Differential Reproduction: organisms with the best adaptations will survive the most to reproduce
The mechanism for descent with modification…
4 parts of the theory:
Fitness = a measure of an individual’s hereditary contribution to the next generation
1) Overproduction: Organisms have a large potential to reproduce but are limited by environment & resources
2) Genetic Variation: Individuals vary within a population, and this variation can be passed to offspring.
3) Struggle to Survive: Individuals struggle to survive and some variations benefit the struggle others are a hindrance

7. Homework
Read p
Do problems p 301 # 1-6