Theory of evolution by natural selection

Example

How does natural selection work

What is natural selection

key features of evolution by natural selection

what is evolution by natural selection

why is natural selection important for populations

mechanism of evolution

used to account for millions of species that live on earth

states that the most complex organisms occur totally by natural selection

genetic mutations are beneficial to an individual are passed on to reproduction

results in a new generation of organisms that are more likely to survive and reproduce

example

giraffes have evolved to have long necks

shorter necks access less foods which should be unlikely to survive and pass on their genes

individuals have characteristics that give it an increased change of survival where they live

organisms that survive are better adapted

process where populations of living organisms adapt and change

Deer mince

migrated from Nebraska

change from dark brown to light brown

this was a genetic change

helped them hide from predators

occurs when mutations change to an organism DNA are advantageous

allowing them to survive in the environment

Darwin's process of natural selection had four componets

Variation

Inheritance

high rates of population growth

survival and reproduction

favourable traits are passed on to offspring

animals survive and reproduce

variations include: hair, colour, size

more offspring being produced

if the environment rapidly changes

animals might not be able to adapt quickly enough through natural selection

process through populations of living organisms change and adapt

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favourable traits are passed on

through generations

natural selection can lead to speciation

one species gives a rise to a new and obesely different species

one of the process that drives evolution and helps explain diversity of life on earth

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