Natural Selection vs.
Selective Breeding
Environmental and Human Influences

Natural Selection Selective Breeding

Process by which organisms that are
most suited to their environment survive and reproduce most successfully.

Method of breeding that allows only those organisms with desired
characteristics to produce the next generation.
Natural Selection vs. Selective Breeding

Reproduction
Variation
Competition
Survival
Fittest: Lives long enough to reproduce

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Do you remember these guys?

The adaptation of a population in response to pollution.

“Industrial Melanism”- darkness- of the skin, feathers, or fur. Acquired by a population of animals living in an industrial region where the environment is soot-darkened.

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Manchester, England from
1845 to 1890.
Before the industrial revolution, the trunks of the trees in the forest around
Manchester were light grayish-green due to the presence of lichens.

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Most of the peppered moths in the area were light colored with dark spots.
As the industrial revolution progressed, the tree trunks became covered with soot and turned dark.
Over a period of 45 years, the dark variety of the peppered moth became more common.

NATURAL
SELECTION
Summary: Environmental
Influence due to organism adaptation.

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Mouth parts ex: beaks, teeth
External color
 ex: fur, scales, feathers
Behavior

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1850’s: Charles
Darwin described how organisms might change over time.
Theory of Evolution
5 years of observations on the islands.

Galapagos
Finches

SELECTIVE
BREEDING
Summary: Human Influence on characteristics and behavior .

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Domestic Animals
◦ Ex: Chickens, Dogs, Cows
Plants:
◦ Ex: Corn, Brasilica, Fruit hybrids https://www.youtube.com/watch?v=W_CnR0A k604&index=2&list=PLgr6dnNbT5pG7CKfkScfNEDWjeUZr9FI

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Various animals that have been tamed and made fit for a human environment.

 http://www.discovery.com/tv-shows/othershows/videos/assignment-discovery-shortsartificial-selection/

HYBRID FRUITS
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Nectarcots
Pluots
How many types of apples are there?