GRE Biology: Genetic Variability, Evolutionary Processes and Consequences 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. Punctuated equilibria describes which phenomenon?

Question 2 2.

Which of the following is an example of natural selection?

I. Albino animals are rare in nature because they are easy for predators to find.

II. The fastest gazelle is least likely to be eaten by a lion.

III. The gorilla that is strong enough to become alpha male is the most likely to pass on his genes.

Question 3 3.

Which of the following is an example of polyploidy?

I. An insect with n = 4 has 8 total chromosomes in each somatic cell

II. A plant with n = 12 has 48 total chromosomes in each somatic cell

III. A fish with n = 66 has 132 total chromosomes in each somatic cell

Question 4 4.

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.

Question 5 5. Using the criteria outlined in the Hardy-Weinberg equilibrium, determine which of the following populations can be balanced.

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Question 6 6. Which is NOT a trait that might be selected for through artificial selection?

Question 7 7. 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 is this population in equilibrium? Why or why not?

Question 8 8. 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 9 9. 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 10 10. A farmer mates a goat and a sheep together. However, he finds he cannot use this hybrid animal to produce any new hybrids. This is an example of _____.

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Question 11 11. Which does NOT provide evidence for evolution?

Question 12 12. Spatial isolation is the main reason why _____ do not mate.

Question 13 13. A scientist has observed animals in a particular habitat for some time. She notices that in a population of birds those with either short or long beaks can find more food than those with average sized beaks. Over time, she notices a higher proportion of birds in the population have either short or long beaks. She is observing:

Question 14 14. One species of sea urchin is able to mate with another, but fertilization is rarely successful. What is this an example of?

Question 15 15. One way to overcome behavioral isolation that prevents animals from reproducing might be to _____.

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Question 16 16. A zoo wants to assist two related endangered species with their reproduction and plans to directly implant the sperm into the female. Which type of isolation can NOT be overcome in this way?

Question 17 17. Which best describes the general rate of evolution?

Question 18 18. Which is true about evolution?

Question 19 19. Why is the peppered moth phenomenon uncommon?

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 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?

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Question 21 21.

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 22 22. Genetic variability describes which of the following?

Question 23 23. 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?

Question 24 24. What are homologous genes?

Question 25 25. Which of the following forces is LEAST likely to cause a new species to arise in a population?

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Question 26 26.

Which of the following criteria must be met for Hardy-Weinberg equilibrium?

I. Beneficial trait

II. Non-random mating

III. Large population size

Question 27 27. Which of the following statements about species is MOST accurate?

Question 28 28. How did the Industrial Revolution help the dark-colored moths become more common?

Question 29 29. How does the fossil record support evolution?

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. What is the allelic frequency of the g allele?

GRE Biology: Genetic Variability, Evolutionary Processes and Consequences 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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