Mechanism of Evolution

There are 2 herds of Caribou in Northwestern Montana, one male Caribou strays from one herd to mate with a female in the other herd. What mechanism of evolution is this?

• Natural Selection

• Gene Flow

• Genetic Drift

DDT was once considered a ʺsilver bulletʺ that would permanently eradicate insect pests. Today, instead, DDT is largely useless against many insects because insects today are resistant against DDT. This is because when first used, DDT killed most of the bugs, however some were left behind because they has some resistance to DDT.

• Natural Selection

• Gene Flow

• Genetic Drift

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During the industrial revolution, many of the light colored birch trees in England were covered with pollution which turned them a darker black color. Subsequently moth populations that were light in color were easily eaten by birds. After several generations, moths with darker wings started to become more frequent in the population because they blended in with the polluted trees

• Natural Selection

• Gene Flow

• Genetic Drift

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An area had a diverse population until an unexpected earthquake hit and most of people that survived were of Native American descent, what would this event be called?

• Natural Selection

• Gene Flow

• Genetic Drift

A volcano erupts in northwest Washington state that kills a large percentage of conifer trees. After 50 years of growth the conifer trees remain in small numbers due to the natural disaster.

• Natural Selection

• Gene Flow

• Genetic Drift

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In a forest a large fire broke out that destroyed much of the area. There were 2 large populations of rabbits, one with brown fur and the other with white fur. After the fire there were hardly any of the rabbits with white fur left. What mechanism of evolution is at work here?

• Natural Selection

• Gene Flow

• Genetic Drift

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Female peacocks select the males with the most spots on the male’s tails to breed with. Males with less spots don’t reproduce with females as much as males with many spots.

• Natural Selection

• Gene Flow

• Genetic Drift

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The northern elephant seal population was reduced by over hunting to 20 individuals in the 1890s. Although the population had rebounded to over 30,000 individuals by 1974, the genetic diversity is still low within the current population.

• Natural Selection

• Gene Flow

• Genetic Drift

A wildflower population consisting of blue, purple and pink flowers is subjected to a mudslide that kills most of the blue ones. As time progresses, blue flowers eventually die out, leaving only purple and pink wildflowers.

• Natural Selection

• Gene Flow

• Genetic Drift

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Blue-eyed people from Sweden move to a small town in Mexico where people all have brown eyes. When they mate, some of their children now have blue eyes.

• Natural Selection

• Gene Flow

• Genetic Drift

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