Darwinian Evolution final

Plus de détails

threats to Biodiversity

par Dhaliwal Bvneet

Natural Transformation in Gram negative bacteria

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Biological Evolution

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Charles Darwin

par nahla Elsherbiny

Darwinian Evolution

his theory

has been observable and tested

genetic mutation

artificial selection

study of living species

the fossil record

Evolution;

does not contradict religion

because they are two different unrelated things

is not a random process

definition of evolution

it's a cumulative change that occur in a population overtime

Important concepts

Micro and Macro evolution which are the study of evolution in both small and large scales

genes: portions of an organism's DNA that carry the code responsible for the built of that's oragnism

Species: a group of interbreeding or potentially interbreeding populations

his misunderstoods

that his theory is false due to the incomplete record fossil

fossilization is a very rare eent

that evolution is related to the origin of life

which is wrong because evolution deals with the way of life after it's origin

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

His book of the "Origins of Species"

he discovered the finches which looked different

introduced the concept of mutation and changes in species

discussed natural selection and the survival of the fittest

His propositions

divergence which result from isolation

variation will be favoured which will give tendency for varieties to become more distinct

changes in circumstances will favour transmission of advantageous features in new conditions

that selectve action struggle for existence

that artificial selection had a marked effect

Mechanisms

Adaptation: common feature that prvides improved function

Genetic Variation contains 3 sources:mutations, gene flow, sex

Artifical selection: is the intentional reproduction of individuals that have desirable traits

Natural selection: nature chooses those better able to survive and reproduce

Biological evolution

all life on earth shares a common ancestor and this led to the great diversity in the kind of species

descent with modification through genetic inheritance