Natural Selection - CRC

New traits usually occur due to:

• Random genetic mutations

• An organism adapting

• Effects from the environment

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Check all of the options below that are SELECTION FACTORS, which determine whether a trait helps or hurts an organism. (choose more than one)

• Obtaining food

• Surviving climate changes

• Escaping predators

• Moving fast

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If a new trait DOES NOT help an organism survive, what may happen to it?

• It dies and its DNA is not passed on

• It survives and its DNA is passed on

• It changes its traits to adapt and survive

If a new trait DOES help an organism survive, what may happen to it?

• It dies and its DNA is not passed on

• It survives and its DNA is passed on

• It changes its traits to adapt and survive

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What happens to new traits that HELP organisms survive over time?

• They become MORE COMMON

• They become LESS COMMON

• They are EQUALLY COMMON

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What happened to the peppered moth population after the Industrial Revolution?

• There were MORE LIGHT moths because the bird couldn't see them on the DARK TREES

• There were MORE DARK moths because the bird couldn't see them on the DARK TREES

• There were MORE DARK moths because the bird couldn't see them on the LIGHT TREES

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Which traits were selected for in whale ancestors?

• Traits that helped them walk on land

• Traits that helped them move in water

• Traits that helped them give birth

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Which trait was selected for in therapod dinosaurs which led to modern day birds?

• Feathers - for warmth or mating

• Feathers - for flying

• A wish bone - for flying

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Which trait was selected for in Tiktaalik which led to the evolution of tetrapods?

• Fins so it could swim in water

• Four limbs so it could walk on land

• Lungs so it could breathe air

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