Mechanisms

Reindeer from a rancher in Alaska escape from their pen during an enormous snow storm. After their escape, they mate with wild caribou that are migrating across the land. The offspring of these have traits for short legs and have tame behavior.

• Gene Flow

• Genetic Drift

• Non-Random Mating

• Natural Selection

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Males of the bighorn sheep species fight one another to show females who is the dominant male and are more likely to mate with females.

• Natural Selection

• Mutation

• Genetic Drift

• Non-Random Mating

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Insects become resistant to pesticides very quickly, sometime in one generation. If an insect is resistant to the chemical, most of the offspring will also be resistant. Considering that insect generations can be a matter of weeks, insects in an area can become immune to a chemical within months.

• Mutation

• Natural Selection

• Genetic Drift

• Gene Flow

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A chemical spill causes the offspring of ladybugs to have blue dots instead of black dots.

• Natural Selection

• Genetic Drift

• Mutation

• Gene Flow

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Match the following

• Variation

• A tiger may produce many offspring, but not all of the young will survive due to competition for resources.

• Overproduction

• Some tigers may be born with slightly larger jaws and teeth due to natural variation in the population.

• Adaptation

• Tigers with larger jaws and teeth are able to eat shelled reptiles. These tigers are likely to survive longer and leave more offspring than tigers that can eat only mammals.

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A grizzly bear survives because he is well-adapted (best fit) 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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What process is being shown in this image?

• Variation

• Natural Selection

• Selective Breeding

• Homeostasis

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The country of Sweden is known for having people with blonde hair and blue eyes. One day a family moves from Sweden to India where dark hair and dark eyes are very common. A female from Sweden marries a male from India and their offspring now have blonde hair and blue eyed traits.

• Natural Selection

• Mutation

• Non-Random Mating

• Gene Flow

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A certain type of plant can produce blue or yellow flowers. During a fire, many yellow flowers are destroyed and now since blue is the dominant trait, the plant reproduces offspring that produce only blue flowers.

• Non-Random Mating

• Gene Flow

• Mutation

• Genetic Drift

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Some organisms of a population of birds are born with extra-long beaks instead of a normal sized beak.

• Gene Flow

• Natural Selection

• Genetic Drift

• Mutation

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