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Natural and artificial selection

Chapter 3.1 Science 10

Neil Ryan

on 4 June 2018

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Transcript of Natural and artificial selection

Artificial and

Living organisms have an incredible ability to adapt to change.
When natural processes
cause a change to a
population we call this natural selection.
In natural selection, the best-adapted members of a species will survive and reproduce.
These individuals then pass along the favorable characteristics to their offspring
This is the basis for Adaptive radiation
The most famous example of natural
selection are the 13 species of finches
inhabiting the Galapagos Islands
This may take 100's of years
Natural Selection
This change can be the result
of a mutation, changes to the
environment or as a result of
human input.
Artificially selected traits are based on what the person breeding the plants and animals desires.
Artificial selection acts by increasing the frequency of desirable traits in the population.
We have used this to domesticate dogs and cats
We use this in agriculture to create crops of high yield, bigger size, better flavor or to suit the environment.
Farmers can 'naturally' create super herds
Problem : What is a major danger of artificial selection?

The major danger of artificial selection is that traits that lower the fitness of a species can be increased in frequency in the population.
Ultimately this could lead
to extinction of a population
We believe that the diversity and interrelation of all life on earth are best explained by the God-ordained process of evolution and common descent. Thus, evolution is not in opposition to God, but a means by which God providentially achieves his purposes.

Artificial selection is the selective breeding of species by humans to increase desirable traits.
How can Natural selection affect a species
Directional selection occurs most often under environmental changes and when populations migrate to new areas with different environmental pressures.
Can diminish the genetic diversity
Stabilizing selection causes the narrowing of the phenotypes seen in a population.
The extremes are less favorable
Disruptive selection, describes changes in populations in which extreme values for a trait are favored.
Often the population is divided into two distinct groups.
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