CCR Biology - Chapter 7 Practice Test - Summer 2012

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1 Name: Class: Date: CCR Biology - Chapter 7 Practice Test - Summer 2012 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. 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. 2. Gene expression is influenced by many factors. Which of the following is a factor in gene expression? a. karyotype b. pedigree c. environment d. phenotype 3. The Punnett square in Figure 7.1 shows a cross between two parents who have the genotype Ss for a genetic disorder caused by a recessive allele. Which of the following will have the genetic disorder? a. Ss parent b. Ss offspring c. SS offspring d. ss offspring 4. 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% 5. For an XX female to express a recessive sex-linked trait, she must have a. a Y chromosome. b. an inactivated allele. c. two recessive alleles. d. two dominant alleles. 1

2 Name: 6. 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. 7. Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that prevents fur coloration. What color fur will the mouse have? a. all white b. mostly black c. entirely gray d. black and white 8. 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 14.5 map units. b. A and B cross over 2.5% 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. 9. Thomas Morgan's research with fruit flies determined that a. alleles always assort independently. b. chromosomes are inherited as a group. c. genes never assort independently. d. traits sometimes are inherited as a group. 10. Two genes cross over 6% of the time. This percentage means that the genes are a. inactivated in 6 out of 100 offspring. b. incompletely dominant in 6 out of 100 offspring. c. not inherited together in 6 out of 100 offspring. d. on sex chromosomes in 6 out of 100 offspring. 11. 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 12. 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 2

3 Name: 13. Some members of a family have a recessive sex-linked disorder. Which of the following statements about the family would be true? a. All males would have the disorder. b. All females would be carriers. c. Only males would have the disorder. d. Only females would be carriers. 14. What is the main reason that sex-linked disorders are most often observed in males? a. The X chromosome only has genes for genetic disorders. b. The Y chromosome cannot have genes that cause genetic disorders. c. The Y chromosome cannot mask alleles on the X chromosome. d. The X chromosome has genes only for sex determination. 15. Which of the following tools is used to match up chromosome pairs using chemical stains? a. pedigree chart b. karyotype c. meiosis map d. linkage map Multiple Choice 16. Someone who is heterozygous for a recessive allele that causes a disorder a. is not a carrier of the disorder. b. will not have the disorder. c. cannot have offspring with the disorder. d. will get the disorder late in life. 17. Phenotype is influenced by many factors, including the chromosome upon which a gene is located, ranges of dominance, and a. karyotype. b. pedigree. c. environment. d. phenotype. 18. The Punnett square in Figure 7.1 shows a cross between two parents who are heterozygous for an autosomal genetic disorder caused by a recessive allele. People with which genotype will have the disorder? a. Ss parent b. Ss offspring c. SS offspring d. ss offspring 3

4 Name: 19. The wide range of eye color indicates that eye color is a. sex-linked. b. recessive. c. polygenic. d. epistatic. 20. One parent is homozygous for a recessive allele and one parent is heterozygous for a recessive allele in an autosomal dominant genetic disorder. What is the chance that a child of those two parents will have the disorder? a. 25% b. 50% c. 75% d. 100% 21. An XX female will express a recessive sex-linked trait if she a. has several codominant alleles for the gene. b. fully expresses her Y chromosome. c. is homozygous for the recessive allele. d. carries the allele on an epistatic gene. 22. Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that produces albinism. What color fur will the mouse have? a. white b. black c. gray d. spotted 23. The crossing of wild type fruit flies with mutant fruit flies resulted in the conclusion that some a. traits assort independently. b. chromosomes are inherited as a group. c. genes assort independently. d. traits are inherited as a group. 24. Two genes on a linkage map are 9 map units apart. This means that in 9 percent of the offspring, the phenotypes from those genes will a. appear codominant. b. disappear. c. appear together. d. not appear together. 25. A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true? a. Neither has the codominant allele. b. Her father has an inactivated allele. c. Both parents have the recessive allele. d. Her mother carries the dominant allele. 4

5 Name: 26. 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. 27. If more males than females in a family have a recessive sex-linked disorder, what can you infer about patterns of inheritance in that family? a. The males would pass on the disorder to sons. b. All females would be carriers of the disorder. c. Females would not develop the disorder. d. Only females would be carriers of the disorder. 28. 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 map distance between C and A is less than the map distance between B and C. b. The actual distance between B and C is greater than the actual distance between C and A. c. The map shows the exact locations of genes A, B, and C on the chromosome. d. Linked inheritance of genes C and A is less probable than linked inheritance of genes B and C. 29. Sex-linked disorders appear more often in males because the Y chromosome a. does not carry sex-linked genes. b. affects phenotype strongly. c. has genes only for sex determination. d. is smaller than the X chromosome. 30. 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 5

6 CCR Biology - Chapter 7 Practice Test - Summer 2012 Answer Section MULTIPLE CHOICE 1. ANS: B PTS: 1 DIF: Level A REF: act0976aaf18007e110_194 KY ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_202 STA: KY 9-12.SC-HS ANS: D PTS: 1 DIF: Level A REF: act0976aaf18007e110_210 KY KY ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_223 KY KY KY ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_240 KY ANS: A PTS: 1 DIF: Level A REF: act0976aaf18007e110_248 KY ANS: A PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: D PTS: 1 DIF: Level A REF: act0976aaf18007e110_264 KY KY KY ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_280 KY ANS: A PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: D PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: C PTS: 1 DIF: Level A REF: act0976aaf18007e110_312 1

7 15. ANS: B PTS: 1 DIF: Level A REF: act0976aaf18007e110_ ANS: B PTS: 1 DIF: Level B REF: act0976aaf18007e111_14 KY ANS: C PTS: 1 DIF: Level B REF: act0976aaf18007e111_22 KY KY 9-12.SC-HS ANS: D PTS: 1 DIF: Level B REF: act0976aaf18007e111_30 KY KY ANS: C PTS: 1 DIF: Level B REF: act0976aaf18007e111_54 KY ANS: B PTS: 1 DIF: Level B REF: act0976aaf18007e111_38 KY KY KY ANS: C PTS: 1 DIF: Level B REF: act0976aaf18007e111_ ANS: A PTS: 1 DIF: Level B REF: act0976aaf18007e111_62 KY ANS: D PTS: 1 DIF: Level B REF: act0976aaf18007e111_79 STA: KY KY ANS: D PTS: 1 DIF: Level B REF: act0976aaf18007e111_ ANS: C PTS: 1 DIF: Level B REF: act0976aaf18007e111_95 KY ANS: B PTS: 1 DIF: Level B REF: act0976aaf18007e111_103 KY ANS: D PTS: 1 DIF: Level B REF: act0976aaf18007e111_ ANS: A PTS: 1 DIF: Level B REF: act0976aaf18007e111_ ANS: C PTS: 1 DIF: Level B REF: act0976aaf18007e111_119 KY ANS: B PTS: 1 DIF: Level B REF: act0976aaf18007e111_127 2

8 CCR Biology - Chapter 7 Practice Test - Summer 2012 [Answer Strip] _ C 6. _ D 13. _ C 19. _ B 26. _ B 1. _ A 7. _ C 14. _ B 20. _ D 27. _ C 2. _ A 8. _ B 15. _ C 21. _ A 28. _ D 3. _ A 22. _ B 16. _ D 9. _ C 17. _ D 23. _ C 29. _ C 4. _ C 10. _ D 18. _ D 24. _ B 30. _ C 11. _ C 5. _ C 25. _ A 12.

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