Unit 6 Evolution Origins of life

Where the better adapted organisms survive to pass traits along to offspring.

• Evolution
• Natural Selection
• Extinction
• Artifical Selection

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Why are advantageous traits more likely to be passed onto offspring?

• Because they are more likely to survive and reproduce.
• Because they come from dominant alleles.
• Because they come from recessive alleles.
• Because the trait is an acquired phenotype.

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Natural selection is when ____________ decides who survives and who doesn't

• nature
• humans
• animals
• years

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Change over time

• Natural Selection
• Selective Breeding
• Homeostasis
• Evolution

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Structures with the same parts have different functions; suggests that organisms share a common ancestry

• vestigial structures
• homologous structures
• adaptive radiation
• fossil

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According to chemical evolution theory, which of the following events would need to occur first for life to evolve?

• onset of photosynthesis

• origin of DNA

• synthesis of organic molecules

• formation of volcano

Which is least likely to help scientists explain the origin of life on Earth?

• how organelles developed from symbiotic organisms

• how pollution is affecting life in the ocean

• how the atmosphere became rich in oxygen

• how cells could develop from nonliving matter

The heterotroph hypothesis says the first life forms did not use oxygen for respiration and were unable to make their own food. Based on this theory, which types of organisms were most likely present

• aerobic, autotrophic bacteria 

• aerobic, heterotrophic bacteria

• anaerobic, autotrophic bacteria

• anaerobic, heterotrophic bacteria

What is an analogous structure?

• Same structure, different function

• Different structure, same function

• A structure with no function

What is a vestigial structure?

• Same structure, different function

• Different structure, same function

• A structure with no function

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