The Role of Natural Selection in 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. 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 2 2. 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 3 3. What of the following is an example of reproductive isolation?

Question 4 4. An example of hybrid breakdown may be found in which one of the following?

Question 5 5. Why does natural selection act on phenotypes and not genotypes?

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Question 6 6. Which best defines phenotype?

Question 7 7. Using the criteria outlined in the Hardy-Weinberg equilibrium, determine which of the following populations can be balanced.

Question 8 8.

Select the statements about Hardy-Weinberg equilibrium that are true.

I. Hardy-Weinberg equilibrium is often found in the wild.

II. The allele frequency of a population in Hardy-Weinberg equilibrium does not change.

III. The Hardy-Weinberg equation predicts the evolutionary agent affecting a population.

Question 9 9. The malaria/sickle-cell relationship is an example of which type of diversity maintaining mechanism?

Question 10 10. What is the heterozygote advantage?

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Question 11 11. 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 12 12. 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. 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 chance that I will catch a fish with a long dorsal spine from this population?

Question 13 13. A haploid gamete has how many sets of chromosomes?

Question 14 14. Which of the following is NOT true about meiosis?

Question 15 15. Why does the island of Madagascar have a unique population?

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Question 16 16. If an allele were completely removed from a population, then what would be the effect on the population's genetic diversity?

Question 17 17. The ability of an individual to survive and reproduce is called _____.

Question 18 18. Which is NOT true of natural selection?

Question 19 19. Some studies have shown that a single copy of the cystic fibrosis disease allele can confer resistance to tuberculosis to a person. This is an example of:

Question 20 20. 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:

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Question 21 21. Which of the following is an example of divergent evolution?

Question 22 22. What is divergent evolution?

Question 23 23. 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?

Question 24 24. A pre-zygotic barrier prevents which of the following?

Question 25 25. Natural selection alters which of the following?

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Question 26 26. Why do scientists use the Hardy-Weinberg equation?

Question 27 27. Why is genetic diversity essential to a population's survival?

Question 28 28. After observing a population of fish with interesting protective spines, a scientist decides to move two of the fish into a new pond to create a new population of fish to study the ability of the fish to survive a new set of predators. Which of the following evolutionary agents did the scientist introduce?

Question 29 29. How does crossing over contribute to genetic variation?

Question 30 30. The effects of genetic drift will be greater for what kind of populations?

The Role of Natural Selection in 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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