Natural Selection Review

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Presentation transcript:

Natural Selection Review

The gradual change in species over time is called what?

Answer Evolution !!!

A trait that helps an organism survive and reproduce is called a?? A. Mutation B. Selection C. adaptation D. variation

What kind of evidence suggest that ancestors of whales walked on land? A. There are fossils of whale like creatures that had legs B. Whales look like they walk when they swim C. Whales have some DNA like elephants D. Whales breath air

Branching Tree (not on test)

Punctuated equilibria (not on test)

What is the role of genes in evolution ?

Answer Genes control traits. Traits are selected on by natural selection

Explain Lamarck's ideas of Use and Disuse and inheritance of acquired characteristics?

Answer Use and disuse - This effort to improve causes the most used body structures to develop, the unused structures waste away Acquired characteristics- Once the structure is modified, the modification is inherited by the organism’s offspring

What are some ways genetic variation is created in a population ?

Answer Mutations and sexual reproduction

What is responsible for the mass extinctions throughout earths history?

Answer Extreme changes in the environment

How do fossils help support the theory of evolution ?

Answer Fossils show how organisms have changed over time. They also show that mass extinctions have occurred throughout earths history and has allowed for the appearance and disappearance of species throughout earths history.