Biology - Unit 7 - Evolution and Natural Selection

A grizzly bear survives because he is well-adapted to his environment. When he reproduces he passes on those traits to his offspring. this process is called

• Natural Selection

• Selective Breeding

• Random mutations

• Variations in a species

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The peppered moth's color camouflaged it on the light colored tree bark. It's color was an example of a/n

• Variation

• Dominant trait

• Recessive trait

• Adaptation

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Why might it be helpful for a species to have a lot of variations within its members?

• They can't be seen by predators

• If the environment changes, they might be better able to adapt

• It is helpful in asexual reproduction

• They don't recognize each other

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Changes in inherited characteristics can cause a species to change into a new one. This change over time is called?

• Graduation

• Selective Breeding

• Revolution

• Evolution

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On the Galapagos Islands, different finches evolved on different islands to fit their environment. When a species develops unique traits because it is trapped in one area this is called:

• Geographic isolation

• Geologic separation

• General relocation

• Genetic differentiation

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One female salmon can lay hundreds of eggs. Why doesn't the salmon population increase dramatically?

• Salmon reproduce asexually

• Most offspring do not grow up to reproduce

• Salmon eggs don't hatch

• Salmon are extinct

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What is the definition of natural selection?

• Genes that are chosen by humans such as farmers and ranchers
• Organisms that are chosen by environmental pressures such as climate, available food, predators and habitat.
• Dogs and Wolves
• Genes that are chosen by scientist and academics. 

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How are new traits introduced into a population?

• Photosynthesis
• Cell Membrane
• Turtles 
• Mutations 

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Over several generations, dog breeders selected traits that were helpful to humans, such as hunting ability. This is an example of

• artificial selection.

• natural selection.

• sexual selection.

Howler monkeys with smaller testicles tend to howl louder and with deeper tone (not a joke!). This type of compensation in order to attract a female would be an example of

• sexual selection.

• artificial selection.

• natural selection.

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