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Chapter 7 Test Review

Chapter 7 Test Review. January 31, 2011 Biology I. A person who has a disorder caused by a recessive allele is a. considered a carrier of the disorder. b. homozygous for the recessive allele. c. unable to pass the allele to offspring. d. certain to have offspring with the disorder.

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Chapter 7 Test Review

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  1. Chapter 7 Test Review January 31, 2011 Biology I

  2. A person who has a disorder caused by a recessive allele isa. considered a carrier of the disorder. b. homozygous for the recessive allele. c. unable to pass the allele to offspring. d. certain to have offspring with the disorder. Present your answers! B

  3. Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance that any of their children will inherit the disorder? a. 25% b. 50% c. 75% d. 100% Present your answers! C

  4. Human height occurs in a continuous range because it is affected by the interaction of several genes, making it a a. autosomal trait. b. sex-linked trait. c. polygenic trait. d. codominant trait. Present your answers! C

  5. The gene linkage map shown in Figure 7.2 shows the order of genes A, B, and C. Which of the following statements about the genes is true? a. The distance between A and B is 6 map units. b. A and B cross over 14.5% of the time. c. A and C are linked 8.5% of the time. d. B and C are most likely to be inherited together. Present your answers! B

  6. A female is born with attached earlobes, which is a recessive phenotype. Which of the following genotypes could her parents have? a. RR and RR b. Rr and RR c. Rr and rr d. RR and rr Present your answers! C

  7. Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true? a. does not have the disorder but can pass it on b. will develop the disorder only late in life c. cannot pass the disorder to sons, just daughters d. the allele is not passed on due to Y chromosome inactivation Present your answers! A

  8. Which of the following tools is used to match up chromosomes by homologous pairs? a. pedigree chart b. karyotype c. meiosis map d. linkage map Present your answers! B

  9. Suppose a person is homozygous recessive for a recessive genetic disorder. This genotype means that the person a. is a carrier for the disorder. b. has the genetic disorder. c. cannot pass on the gene. d. is healthy and is not a carrier. Present your answers! B

  10. Down syndrome is characterized by having an extra copy of at least a portion of chromosome 21. Which of the following methods would quickly identify the disorder? a. pedigree chart b. karyotype c. meiosis map d. linkage map Present your answers! B

  11. Variation in human skin color is an example of a. incomplete dominance. b. codominance. c. polygenic traits. d. multiple alleles. Present your answers! C

  12. What is shown in Figure 11–3? a. independent assortment b. anaphase I of meiosis c. crossing-over d. replication Present your answers! C

  13. Linked genes a. are never separated. b. assort independently. c. are on the same chromosome. d. are always recessive. Present your answers! C

  14. Linkage maps are based on a. the frequencies (or percentages) of crossing-over between genes. b. independent assortment. c. genetic diversity. d. the number of genes in a cell. Present your answers! A

  15. If two genes are on the same chromosome and rarely assort independently (in other words, rarely separated by crossing over), a. crossing-over never occurs between the genes. b. crossing-over always occurs between the genes. c. the genes are probably located far apart from each other. d. the genes are probably located close to each other. Present your answers! D

  16. Hemophilia is X-linked recessive. Refer to Figure 11-1. If individual III-2 marries a person with the same genotype as individual I-1, what is the chance that one of their children will be afflicted with hemophilia? a. 0% b. 25% c. 50% d. 75% Present your answers! A

  17. For the trait being followed in the pedigree, individuals II-1 and II-4 in Figure 11-1 can be classified as ____. a. homozygous dominant b. mutants c. homozygous recessive d. carriers Present your answers! D

  18. What is the relationship between individual I-1 and individual III-2 in Figure 11-1? a. grandfather-granddaughter b. grandmother-grandson c. great aunt-nephew d. mother-son Present your answers! B

  19. If a female fruit fly heterozygous for red eyes (XRXr) crossed with a white-eyed male (XrY), what percent of their offspring would have white eyes? a. 0% b. 25% c. 50% d. 75% Present your answers! C

  20. A cross between a white rooster and a black hen results in 100% blue Andalusian offspring. When two of these blue offspring are mated, the probable phenotypic ratio seen in their offspring would be ____. a. 100% blue b. 75% black, 25% white c. 75% blue, 25% white d. 25% black, 50% blue, 25% white Present your answers! D

  21. Examine the graph in Figure 11-3, which illustrates the frequency in types of skin pigmentation in humans. Another human trait that would show a similar inheritance pattern and frequency of distribution is ____. a. height b. blood type c. number of fingers and toes d. incidence of cystic fibrosis Present your answers! A

  22. A man heterozygous for blood type A marries a woman heterozygous for blood type B. The chance that their first child will have type O blood is ____. a. 0% b. 25% c. 50% d. 75% Present your answers! B

  23. This pedigree shows the transmission of a rare disease that is debilitating but not lethal. Carriers are not shown. Which type of heredity does the pedigree in Figure 11-6 demonstrate? a. autosomal recessive b. autosomal dominant c. X-linked recessive d. X-linkeddominant Present your answers! C

  24. The X and Y chromosomes are called the a. extra chromosomes. b. phenotypes. c. sex chromosomes. d. All of the above Present your answers! C

  25. female : XX :: a. female : gametes b. female : eggs c. male : YY d. male : XY Present your answers! D

  26. A diagram in which several generations of a family and the occurrence of certain genetic characteristics are shown is called a a. Punnett square. b. monohybrid cross. c. pedigree. d. family karyotype. Present your answers! C

  27. Which of the following traits is controlled by multiple alleles in humans? a. sickle cell anemia b. blood type c. hemophilia d. pattern baldness Present your answers! B

  28. What would be the blood type of a person who inherited an A allele from one parent and an O allele from the other? a. type A b. type B c. type AB d. type O Present your answers! A

  29. While studying several generations of a particular family, a geneticist observed that a certain disease was found equally in males and females and that all children who had the disease had parents who also had the disease. The gene coding for this disease is probably a. sex-linked recessive. b. sex-linked dominant. c. autosomal recessive. d. autosomal dominant. Present your answers! D

  30. If a characteristic is sex-linked, it a. occurs most commonly in males. b. occurs only in females. c. can never occur in females. d. is always fatal. Present your answers! A

  31. If a characteristic is sex-linked, the gene for it is found on a. a sex chromosome. b. an autosome. c. a linked chromosome. d. an allele. Present your answers! A

  32. In humans, eye color and height are controlled by a. simple dominance. b. multiple alleles. c. polygenic inheritance. d. incomplete dominance. Present your answers! C

  33. How many chromosomes are shown in a normal human karyotype? a. 2 b. 23 c. 44 d. 46 Present your answers! D

  34. Which of the following are shown in a karyotype? a. homologous chromosomes b. sex chromosomes c. autosomes d. all of the above Present your answers! D

  35. Which of the following can be observed in a karyotype? a. a change in a DNA base b. an extra chromosome c. genes d. alleles Present your answers! B

  36. In a pedigree, a circle represents a(an) a. male. b. female. c. child. d. adult. Present your answers! B

  37. Which of the following genotypes result in the same phenotype? a. IAIA and IAIB b. IBIB and IBi c. IBIB and IAIB d. IBi and ii Present your answers! B

  38. The abnormality of the karyotype shown in Figure 11-7 is ____________________. Present your answers! 3 #21’s (Down syndrome)

  39. The karyotype in Figure 11-7 has a total of ____________________ chromosomes. Present your answers! 47

  40. This person to whom the karyotype in Figure 11-7 belongs has a total of ____________________ autosomes. Present your answers! 45

  41. Inheritance in which two dominant alleles are expressed at the same time is called ____________________. Present your answers! codominance

  42. A phenomenon in which a heterozygous individual has a phenotype that is intermediate between the phenotypes of its two homozygous parents is called ____________________. Present your answers! Incomplete dominance

  43. Two couples, the Pages and the Bakers, had baby boys in the same hospital at the same time. There was a mixup in the hospital nursery. Use the information given in Table 11-1. Which baby belongs to which family? Present your answers! Baby 1- Page Baby 2 – Baker

  44. Use the following information to create a linkage map: C and B are separated by crossing over 15% of the time C and A are separated by crossing over 7% of the time A and B are separated by crossing over 8% of the time Present your answers! B A C

  45. Use the following information to create a linkage map: A and C are separated by crossing over 22% of the time C and B are separated by crossing over 2% of the time C and D are separated by crossing over 4% of the time A and B are separated by crossing over 24% of the time B and D are separated by crossing over 2% of the time A and D are separated by crossing over 26% of the time Present your answers! A C B D

  46. Pure-breeding red radishes crossed with pure-breeding white radishes make purple radishes. a. What is the inheritance pattern of this trait? (incomplete dominance or codominance) b. If you cross a purple radish with a white radish, what percent of the offspring will be purple? Present your answers! • Incomplete dominance • 50%

  47. When pure breeding red cows are bred with pure breeding white cows, the offspring are roan (have red and white hairs). a. What is the inheritance pattern of this trait? (incomplete dominance or codominance) b. If you cross two roan cows, what percent of the offspring will be white? Present your answers! • Codominance • 25%

  48. Ben has type AB blood and Claire has type B blood. Claire’s mother has type O blood. What is the likelihood that Ben and Claire’s child will have type B blood? Present your answers! 50%

  49. The father of a child has type AB blood. The mother has type A. Which blood type(s) can their children NOT have? Present your answers! Type O

  50. The mother has type A blood. Her husband has type B blood. Their child has type O blood. the father claims the child can’t be his. Is he right? Support your answer with a Punnett Square. Present your answers! No, the child can be his

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