Mechanisms of Biological Evolution Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. Which is NOT true about the fossil record?

Question 2 2. How do losses of alleles in natural selection differ from losses of alleles in genetic drift?

Question 3 3. A new mutation allows a cheetah to run faster and hunt down more prey than its slower counterparts. This mutation increased the _____ of the cheetah.

Question 4 4. One way to overcome behavioral isolation that prevents animals from reproducing might be to _____.

Question 5 5.

Which of the following statements does NOT represent the idea of heritability by acquired characteristics?

I. A body builder develops stronger muscles during the course of his life, so his son will be strong as well.

II. A cat that lost its tail will produce offspring with shorter tails.

III. Over time, a population of heavily striped zebras increased over those without as much striping, as the heavily striped ones had a competitive advantage over the zebras with fewer stripes, and were, therefore, better able to reproduce.

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Question 6 6. Which of the following is an example of convergent evolution?

Question 7 7. The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. What is the allelic frequency of the G allele?

Question 8 8. Why is evolution best described as an editing process?

Question 9 9. Which best describes genetic variation?

Question 10 10. Which of the following statements about species is MOST accurate?

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Question 11 11. Why is the peppered moth phenomenon uncommon?

Question 12 12. Which is NOT a trait that might be selected for through artificial selection?

Question 13 13. Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles. The dominant A allele encodes a long dorsal spine and the recessive a allele encodes a short dorsal spine. The fish is diploid and reproduces sexually. The number of AA individuals in this population is 500, the number of Aa individuals is 100, and the number of aa individuals is 400. If a new population was started with 10 AA, 20 Aa, and 10 aa fish, then what are the new allelic frequencies?

Question 14 14. A scientist notices several birds in the same area that are similar in appearance with the exception of different beak lengths. She observes that one type of bird with a particularly long beak can pick bugs out of holes in the ground, while the birds with shorter beaks cannot. The longer beak is an example of

Question 15 15. What is the main difference between natural selection and artificial selection?

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Question 16 16. Two species of plants that do not cross-pollinate are an example of _____ isolation because they flower at different times of the year.

Question 17 17. A scientist mates two different organisms. She observes no offspring. A closer inspection reveals that the hybrid embryo does not develop properly. This is an example of _____.

Question 18 18. Which is true about random mutations?

Question 19 19. A scientist has observed animals in a particular habitat for some time. She notices that the slowest gazelles tend to fall victim to predators more frequently than faster ones. Over time, she notes that the gazelle herd on average runs faster. She is observing:

Question 20 20. Consider a population of fish where the length of a given fish's dorsal spine is determined by a single gene, which is defined by two different alleles. The dominant A allele encodes a long dorsal spine and the recessive an allele encodes a short dorsal spine. The fish is diploid and reproduces sexually. If the number of AA individuals is 500, the number of Aa individuals is 200, and the number of aa individuals is 300, then what is the frequency of 'A' in this population?

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Question 21 21. Spatial isolation is the main reason why _____ do not mate.

Question 22 22. Paleontology is the study of

Question 23 23. Which of the following statements is true?

Question 24 24. Why do scientists use the Hardy-Weinberg equation?

Question 25 25. How did the Industrial Revolution help the dark-colored moths become more common?

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Question 26 26. Which of the following forces is LEAST likely to cause a new species to arise in a population?

Question 27 27. Which is true about evolution?

Question 28 28. Which of the following is NOT a principle of Darwin's theory of evolution?

Question 29 29. Genetic variability describes which of the following?

Question 30 30. The coat color gene of a population of squirrels is defined by a dominant allele G, which encodes a gray coat, and a recessive allele g, which encodes a black coat. In a population, genetic typing reveals the genotypic distribution to be 50 GG, 30 Gg, and 20 gg. If this population is in equilibrium, then what should the genotypic frequency of gg squirrels in this population be?

Mechanisms of Biological Evolution Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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