Natural SelectionNatural Selectionvs.vs.Selective BreedingSelective BreedingEnvironmental and Human Influences

Natural Selection vs. Selective Natural Selection vs. Selective BreedingBreeding

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.

Let’s ReviewLet’s ReviewDo you remember these guys?

The adaptation of a population in The adaptation of a population in response to pollution.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 MothsExample: 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?Can you see the moths?

NATURAL NATURAL SELECTIONSELECTIONSummary: Environmental Influence due to organism adaptation.

Mouth parts ex: beaks, teethExternal color ex: fur, scales,

feathersBehavior

Galapagos IslandsGalapagos Islands1850’s: Charles

Darwin described how organisms might change over time.

Theory of Evolution5 years of

observations on the islands.

Galapagos Galapagos FinchesFinches

SELECTIVE SELECTIVE BREEDINGBREEDINGSummary: Human Influence on characteristics and behavior.

Domestic Animals◦Ex: Chickens, Dogs,

CowsPlants:

◦Ex: Corn, Brasilica, Fruit hybrids

Domestic AnimalsDomestic AnimalsVarious animals that have been

tamed and made fit for a human environment.

HYBRID FRUITSHYBRID FRUITS

NectarcotsPluotsHow many types of apples are there?