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