Biological Evolution
Darwanian Evolution
What Darwin didn't know
What is the ultimate source of variation?
Clarifing his misunderstandings
Science & religion are 2 different things
Religion deals with beliefs beyond natural world
Science-natural causes explain phenomenon
Its both observable and testable
Genetic mutation
Artificial selection
Study of living species
Fossil record
There must be specific conditions for fossilization
Evolutionary theory is the way life changes after its origin
What is better under one condition may not be under another
Darwin's misunderstandings
Evolution and religion are incompatible
Evolution is not science because its not obsevable or testable
Evolutionary theory is false because the fossil record is incomplete
Evolutionary theory is about the origin of life
Evolution is a ladder process with organisms constantly getting better
Humans evovled from Apes
Evidence for evolution
Individuals variations will be favoured by sets of circumstance & give rise to varieties in succesive generations
If changes occur in physical environment, changes will transmit features that are advantageous
When environment reaches a large capacity,forces of struggle for existence between & within species
If Humans could breed over a period of time ,what changes would occur in nature over millions of years
Artificial selection had a marked effect on the form of domesticated plants and animals
Darwin's finches
Varied in beak sizes on different parts of the island
Found on Galapogos Islands
Charles Darwin
Presented theory of evolution
Species arose from a common descendent as a result of divergence
Other important questions and concepts
Evolution versus survival of the fittest
Survival of fittest a mechanism that drives evolutionary change
Darwin's theory as an exampe of scientific method
Published his results in his book "Origins of life"
Formulated a theory that can be falsified
Tested his hypthesis by breeding & comparing data
Hypothesized
Common ancestor
He observed for 5 years
Isn't evolution just a theory that remains unproven
Haven't been proven wrong yet
Withstood the test of time & thousands of scientific experiments
How religion creationist & advocates tackle evolution?
How modern evolutionary biology fits Darwin's work?
Uniformity in genetic code is evidence for Darwin's theory
Changes in base sequence of DNA underlies new traits
Discovery of structure of DNA extended evolution
All variations arose through mutations in genes
Scientific advances supported, refined,expanded his work
Keywords
Principle of divergence
Ladder of progress
Organisms are always getting better
Mutation
Permenant change in genetic material
Fossil
Evidence of ancient life
Natural selection
New species is brought into existence by
Excess of procreation over the number the environment can support
Variation naturally occuring within species
Competition between & within species
Changes in the environment
Artificial Selection
Selective breeding
Species
Group of related interbreeding organisms
