Holt McDougal Modern Biology Chapter 16: Population Genetics and Speciation 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. Why is evolution best described as an editing process?

Question 2 2. 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 _____.

Question 3 3. Punctuated equilibria describes which phenomenon?

Question 4 4. Which is true about random mutations?

Question 5 5. Two species of plants that do not cross-pollinate are an example of _____ isolation because they flower at different times of the year.

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Question 6 6. 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 7 7. A scientist mates a blue population of lizards with a red population of lizards. She observes that one out of ten hybrid offspring survive to adulthood compared to, roughly, eight out of ten blue or red lizards. This is an example of _____.

Question 8 8. Which is true about evolution?

Question 9 9. 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 10 10. 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 _____.

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Question 11 11. 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 12 12. 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 13 13. Which is NOT true about the fossil record?

Question 14 14. 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 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. Spatial isolation is the main reason why _____ do not mate.

Question 18 18. Which best describes the general rate of evolution?

Question 19 19. Which of the following forces is LEAST likely to cause a new species to arise in a population?

Question 20 20.

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.

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Question 21 21. An individual in a wheat population transforms from a diploid to a tetraploid genome. This individual gives rise to a new population of wheat which can no longer successfully mate with the original diploid population. This is an example of:

Question 22 22. Genetic variability describes which of the following?

Question 23 23. How do losses of alleles in natural selection differ from losses of alleles in genetic drift?

Question 24 24. What is a genome?

Question 25 25.

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

I. Beneficial trait

II. Non-random mating

III. Large population size

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Question 26 26. Which of the following statements about species is MOST accurate?

Question 27 27. Which of the following statements is true?

Question 28 28. 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 29 29. A population of lizards is split by an earthquake which leaves half of the population on an island and the other half on the tip of the peninsula. These lizards can't swim. What type of speciation will occur?

Question 30 30. 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?

Holt McDougal Modern Biology Chapter 16: Population Genetics and Speciation 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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