Natural Selection & Selective Breeding

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Presentation transcript:

Natural Selection & Selective Breeding

Natural selection is the process whereby the organisms that are best adapted to a particular environment will survive and reproduce.

Variation in traits (lots of variety in different organisms of the same species) give some individuals a competitive advantage. Natural Selection

These individuals have a competitive advantage These individuals have a competitive advantage. Traits that contribute a competitive advantage become more common in a population. Natural Selection

Natural Selection

NATURE SELECTS

Natural selection depends on genetics and the environment

Some bugs are resistant to pesticides. They will survive and reproduce.

Darwin’s finches

In natural selection, selection pressure is exerted by environmental factors

Natural selection leads to great diversity in nature

Selective breeding is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits by choosing which animal or plant will reproduce and have offspring together. HUMANS CHOOSE Selective breeding

In selective breeding, offspring keep the desired traits of parents

Selection pressure is exerted by …

Selective breeding doesn’t always increase the species chance of survival

Selective breeding can lead to the formation of a new speces in a much shorter time. Photo: 100 years difference

Supercow

Bullmastiff

Corn

Both natural selection and selective breeding Genetic material of an individual was inherited from individuals of the same species.

Both: Variations in traits

Both: It takes many generations for a change to emerge

Natural selection or selective breeding?