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Instructions Below are examples of the three mechanisms of evolution Natural selection genetic drift and gene flow Read each example below In the space provided identify the mechanisms of evolution and explain your choice 1 Insects on a farmer s crop are sprayed with an insecticide Most of the insects die Some survive and pass the resistance to their offspring Next time the crops are sprayed with the same insecticide most of the insects survive a Mechanism of evolution b Expain 2 A Maine coon cat is brought to an island where only wild tabby cats live After mating with other cats on the island some of the kittens have bushy tails and tufted ears a Mechanism of evolution b Explain 3 A large population of marmots about half of which have spots becomes very ill More spotted marmots than un spotted marmots are left as a result un spotted marmots become very rare as time progresses a Mechanism of evolution b Explain 4 A population of flowers on one side of a river transports pollen to the flowers on the other side of the river producing offspring a Mechanism of evolution b Explain 5 In a population of finches there are short thick beaks and long thin beaks After a long drought the only food source remaining are hard seeds that are difficult to crack The birds with the short thick beaks find it easier to crack the seeds These birds are more likely to survive and reproduce a Mechanism of evolution b 6 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 a Mechanism of evolution b Explain 7 Red parrots are brought on an expedition to a remote section of jungle with only blue parrots introducing color variation into the gene pool of jungle parrots a Mechanism of evolution b Explain 8 The very last red billed mallard dies leaving only orange billed mallard populations behind a Mechanism of evolution b Explain

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