Biology Evolution & Extinction

What is Natural Selection?

• Favorable traits that will help one survive in the environment are passed on to offspring.

• All of the species surviving in their environment.

• Species being selected to fight.

• The weaker traits are passed down to offspring.

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What SOURCES of evidence do scientists use today to show evolutionary relationships?

• Trees

• Cladograms

• Phylogenetic Trees

• Homologous

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What is the difference between Homologous and Analogous structures?

• Homologous: same structure, different function.

  Analogous: same structure, same function.

• Homologous: different structure, same function.

  Analogous: different function, same structure.

• Homologous: Cladograms, Poly.

  Analogous: Vial, Friend.

• Homologous: same structure, different function.

  Analogous: same function, different structure.

The study of prehistoric life.

• Mutations

• Coevolution

• Paleontology

• Embryology

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The movement of alleles in or out of a population

• Genetic Drift

• Genetic Flow

• Non-Random Mating

• Natural Selection

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A change in the frequency of existing genes due to a random event/change

• Genetic Flow

• Extinction

• Speciation

• Genetic Drift

What is extinction?

• Species gradually evolving throughout time.

• The elimination of a species mostly caused by a gradual or sudden change in the environment.

• When two or more species affect each other's evolution through the process of natural selection.

• The formation of a new distinct species from preexisting population.

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What is coevolution?

• The study of prehistoric life.

• The study of the structures of organisms.

• When two or more species affect each other's evolution through the process of natural selection.

• Over generations, organisms evolve a variety of characteristics that allow them to survive in different environments.

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Homologous structures?

• This type of structure has the same physical structure across multiple species.

• This type of structure has the same function in multiple species, but different structures.

• This type of structure has no use in a species, but had a purpose to its ancestors.

• Homologous, Analogous, & Vestigial structures are all used as comparison data fir thus field of science.

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Analogous structures

• This type of structure has the same physical structure across multiple species.

• This type of structure has no use in a species, but had a purpose to its ancestors.

• This type of structure has the same function in multiple species, but different structures.

• gene sequences of organisms to determine evolutionary relationships.