Natural Selection

Where do adaptations come from?

• The individual organism decides to adapt

• Mutations that give an organism an advantage in its environment

• Genetic recombination during meiosis

• Both mutations and genetic recombination are sources of adaptation

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Why do frogs and other organism reproduce so many eggs or offspring?

• so that their babies can have friends to play with

• the more offspring the more likely the offspring will survive

• the more offspring the less likely offspring will survive 

• the more offspring the less competition

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Why did the mouse population change over time?

• Their predators changed

• Their environment changed

• The number of offspring changed

• Their food source changed

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Why didn't the mouse populations change significantly in Location A?

• The environment stayed the same

• The predators stayed the same

• The food source changed

• The offspring changed

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A yellow morph and green morph of an insect lives in the rainforest canopy. You would expect:

• the green population to increase and the yellow to decrease

• both populations should stay the same

• both populations will increase

• the green population to decrease and the yellow to increaseThis is a wrong answer

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Definition: fitness

• ability to survive and reproduce in a specific environment

• organisms with traits well suited to their environment survive and reproduce at a greater rate

• a growing population causes a scarcity of resources

• differences in the DNA sequence

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Natural Selection is driven by a change in the environment and survival of the

• Earth

• Fastest

• Fittest

• Biggest

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Speciation can occur as a result of geographic isolation because _________.

• members of a species can no longer find mates

• populations that live in different environments may be exposed to different selection pressures

• exchange of genes during recombination

• movement of genes within a population because of interbreeding

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What did Darwin conclude about the finches on the Galapagos Islands?

• They evolved from a common ancestor on the main land

• They evolved from many different types of birds

• They all came from different countries and continents

• They developed from other types of organisms

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Which of the following is NOT a change that Darwin observed in the finches of Galapagos Islands?

• Size of the Birds

• Beak Shapes

• Feet and talon (claw)sizes

• Number of feathers

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