Darwinian Evolution
Biological evolution
descent with modification through genetic inheritance
all life on earth shares a common ancestor and this led to the great diversity in the kind of species
Mechanisms
Natural selection: nature chooses those better able to survive and reproduce
Artifical selection: is the intentional reproduction of individuals that have desirable traits
Genetic Variation contains 3 sources:mutations, gene flow, sex
Adaptation: common feature that prvides improved function
His propositions
that artificial selection had a marked effect
that selectve action struggle for existence
changes in circumstances will favour transmission of advantageous features in new conditions
variation will be favoured which will give tendency for varieties to become more distinct
divergence which result from isolation
His book of the "Origins of Species"
discussed natural selection and the survival of the fittest
introduced the concept of mutation and changes in species
he discovered the finches which looked different
his misunderstoods
he claims that evolution is a ladder of progress
this has been misunderstood as conditions are changing and what is better under a condition may not under another
that evolution is related to the origin of life
which is wrong because evolution deals with the way of life after it's origin
that his theory is false due to the incomplete record fossil
fossilization is a very rare eent
Important concepts
Species: a group of interbreeding or potentially interbreeding populations
genes: portions of an organism's DNA that carry the code responsible for the built of that's oragnism
Micro and Macro evolution which are the study of evolution in both small and large scales
definition of evolution
it's a cumulative change that occur in a population overtime
Evolution;
is not a random process
does not contradict religion
because they are two different unrelated things
his theory
has been observable and tested
the fossil record
study of living species
artificial selection
genetic mutation