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Natural Selection vs. Selective Breeding

Environmental and Human Influences

Natural Selection Selective Breeding


by which organisms that are most suited to their environment survive and reproduce most successfully.


of breeding that allows only those organisms with desired characteristics to produce the next generation.

Natural Selection vs. Selective Breeding

Let's Review

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.

Example: Peppered Moths

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.

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.

Can you see the moths?


Summary: Environmental Influence due to organism adaptation.

Mouth parts ex: beaks, teeth External color ex: fur, scales, feathers Behavior

Galapagos Islands

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

Galapagos Finches


Summary: Human Influence on characteristics and behavior.

Domestic Animals

Ex: Chickens, Dogs, Cows


Ex: Corn, Brasilica, Fruit hybrids

Domestic Animals

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

Ms. Castro has these kinds of dogs.

Look, there they are again!


Nectarcots Pluots How many types of apples are there?


Natural Selection vs. Selective Breeding

17 pages

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