What do you learn by studying fossils? ( Beginning of Text Book)
- Learn Ancient forms
- Evolution
Define Evolution
A gradual change in the development of something
Define Biological Evolution
The change in the gene pool of a population over the course of time AS A RESULT OF GENETIC DRIFT, MUTATIONS AND NATURAL SELECTION
Other word for biological evolution
modification with descent
what does modification with descent mean?
It means that species develop from a common ancestor
what does modification with descent cover
covers microevolution and macroevolution
What is macroevolution
evolution of different species from common ancestor
what is microevolution
evolution within species
How did life originate?
Life originated from a single origin of life which explains why all organisms have same genetic code and similar enzymes
What was the belief before 1700’s
- Earth was young
- species were unrelated and remained unchanged
what did Darwin, Lamarck and Wallace have in common
- Earth was old
- Species changed over time
What did Erasmus Darwin do?
Put forward the idea of a common ancestor and claimed species changed overtime
Jean Baptiste Lamarck observations
- species are different to fossils
- cross pollination leads to new characteristics
Define Lamarckasism and why was it wrong
Belief that species adapted to environment and passed characteristics down to offspring but he was wrong
Charles Darwin observation
- diversity amongst species
- variation amongst species
- distribution of species
Most Important observation
- Modification with descent ( Species evolved from a common ancestor)
- Natural Selection ( Environment selects the best adapted to survive and reproduce)
Extinction
Expand on Darwins Modification with Descent?
- All organisms came from a common ancestor, however, ancestral species moved into different habitats.
- Adapted to local conditions and modified into new species
- Species died out
Alfred Wallace
Collected wildlife and found the ILLOGICAL DISTRIBUTION OF SPECIES.
Wallace Observation
Ancestors of modern species became isolated from eachother by water and evolved differently
