Natural Selection

The change in the gene pool of species over time that results from genetic changes passed down over successive generations is called

• evolution

• trait

• deoxyribonucleic acid (DNA)

• natural selection

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A characteristic or quality of an organism that is genetically inherited from one generation to the next is known as –

• a variation

• a mutation

• a gene

• a trait

Natural selection is

• the change in the gene pool of species over time that results from genetic changes passed down over successive generations

• Charles Darwin’s theory of survival of the fittest

• a characteristic of an organism; it can be genetic or acquired.

• differences in the alleles among the members of a population

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A characteristic of an organism; it can be genetic or acquired is called

• natural selection

• deoxyribonucleic acid (DNA)

• trait

• evolution

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NGSS.MS-LS4-4

Genetic variation is

• the hereditary material of all life on Earth

• differences in the alleles among the members of a population

• a characteristic of an organism; it can be genetic or acquired.

• the change in the gene pool of species over time that results from genetic changes passed down over successive generations

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NGSS.MS-LS4-4

Deoxyribonucleic acid (DNA) is

• differences in the alleles among the members of a population

• the hereditary material of all life on Earth

• the change in the gene pool of species over time that results from genetic changes passed down over successive generations

• Charles Darwin’s theory of survival of the fittest

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Which of the following provides the best example of a change in genetic traits over several generations in response to natural selection?

• The average root depth of one species of plant increases as average rainfall in the area decreases

• The number of spots on a group of giraffes varies from one individual to the next.

• A group of chimpanzees learns to communicate with their trainer to obtain food.

• Farmers choose to plant only seeds from those crops that proved to be resistant to insects.

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Bromeliads are a family of plants living in a variety of climates. Some have scales or hairs called trichomes that allow the plant to capture and store water. Which of the following best explains why some plants have trichomes and some do not?

• The plants covered in trichomes are much less likely to contract diseases.

• The energy required for a plant to grow trichomes is too costly for most plants.

• Trichomes increase the chances of survival for plants living in areas with infrequent rainfall.

• Trichomes increase the likelihood of animals finding and eating the plant.

Galapagos finches living on different islands feed on a variety of food sources depending on what is available from one island to the next. This has resulted in differences in which adaptation?

• eye color

• wingspan

• vocalizations

• beak shape

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In a group of giraffes, some have longer necks than others. What is likely to be the result of this difference in a trait?

• Giraffes with longer necks have a better chance of survival.

• All giraffes have the same chances of survival.

• Giraffes with shorter necks have a better chance of survival.

• A giraffe's neck does not affect its chances of survival.

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