Unit 5: Natural Selection

Organisms that survive and pass advantageous traits to their offspring

• Artificial Selection

• Natural Selection

• Evolution

• Extinction

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What is variation?

• A type of gene

• A learned behavior

• A change or difference in something

• A characteristic that eventually develops

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Organisms produce more offspring that can survive

• Overproduction

• Struggle to survive

• Inheritance of traits

• Survival of the fittest

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When genetic changes allows an organism to survive in its environment

• Learned behavior

• Acquired traits

• Analogies

• Adaptation

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"Look at these giraffe fossils over time! The necks are so much shorter millions of years ago! I wonder if over time the giraffes reaching for the higher leaves on the Acacia Trees caused the species to grow longer necks!!!"

Who am I?

• Competition

• Descent with modification

• Analogous Structures

• Vestigial Structures

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Which of the following is the correct definition of natural selection?

• The idea that organisms more well equipped for their environment tend to not survive

• None

• The idea that organisms more well equipped for their environment tend to survive longer

• The idea that organisms less equipped for their environment tend to survive longer

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DJ and Johar are brothers, but they don't look alike! How can they be brothers but have variations in their appearance?

• Youngest siblings always get the same traits as their mothers.

• Each child inherits different genes from their parents, in a 50:50 ratio, so they have a mix of traits.

• Male siblings always look like their father.

• Children inherit about 75% of their genes from their mother and 25% from their fathers, so they have a mix of traits.

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Organisms producing more offspring than are likely to survive in order to help ensure that at least some survive until adulthood is known as:

• Evolution

• Competition

• Overproduction

• Variation

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How do adaptations help animals?

• To hide from predators

• All of these are correct

• To hunt for food

• To survive in their habitat

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"Whoa! All these finches used to be one species on this island! Now their beaks are all structurally different! Some are good for functioning as a nutcracker, others an insect cather, others a nectar drinker! I think nature selected these changes over time!"

Who am I?

• Coevolution

• Selected Pressures

• Vestigial Structures

• Descent with Modification

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