Chapter 9


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Chapter 9

  1. 1. Mader's Concepts in Biology, First Edition Copyright © The McGraw-Hill Companies, InC) Permission required for reproduction or display. Sylvia S. Mader Chapter 9
  2. 2. Question 1 <ul><li>Many of the different types of dogs available today are the result of which of the following? </li></ul><ul><li>A. multiple alleles </li></ul><ul><li>B. polygenic inheritance </li></ul><ul><li>C. incomplete dominance </li></ul><ul><li>D. inbreeding </li></ul><ul><li>E. codominance </li></ul>
  3. 3. Question 2 <ul><li>Charles Darwin is sometimes known for developing the fundamental laws of heredity. </li></ul><ul><li>A. true </li></ul><ul><li>B false </li></ul>
  4. 4. Question 3 <ul><li>Which of the following was not a factor in choosing the pea plant to perform genetic experiments? </li></ul><ul><li>A. it has a short generation time </li></ul><ul><li>B. it produces many offspring </li></ul><ul><li>C. the flower is not enclosed in petals </li></ul><ul><li>D. it is easy to culture </li></ul><ul><li>E. they can be easily pollinated </li></ul>
  5. 5. Question 4 <ul><li>If you wanted to study the male portion of a flower, which of the following structures would you be interested in? </li></ul><ul><li>A. the stamen </li></ul><ul><li>B. the carpel </li></ul><ul><li>C. the stigma </li></ul><ul><li>D. the style </li></ul><ul><li>E. the ovary </li></ul>
  6. 6. Question 5 <ul><li>Which of the following parts of the flower produce the egg? </li></ul><ul><li>A. the stamen </li></ul><ul><li>B. the anther </li></ul><ul><li>C. the filament </li></ul><ul><li>D. the pollen </li></ul><ul><li>E. the carpel </li></ul>
  7. 7. Question 6 <ul><li>If a biologist wanted to cross-fertilize two flowers, which of the following steps must be taken? </li></ul><ul><li>A. transfer the egg from one plant to the other </li></ul><ul><li>B. transfer the ovule from one plant to the other </li></ul><ul><li>C. transfer pollen from one plant to the other </li></ul><ul><li>D. transfer a pea from one plant to the other </li></ul><ul><li>E. transfer the stigma from one plant to the other </li></ul>
  8. 8. Question 7 <ul><li>Which of the following was not a trait studied by Mendel in peas? </li></ul><ul><li>A. stem length </li></ul><ul><li>B. seed size </li></ul><ul><li>C. flower color </li></ul><ul><li>D. pod shape </li></ul><ul><li>E. seed color </li></ul>
  9. 9. Question 8 <ul><li>In a mendelian monohybrid cross, the _______ generation is always completely heterozygous. </li></ul><ul><li>A. F1 </li></ul><ul><li>B. F2 </li></ul><ul><li>C. F3 </li></ul><ul><li>D. P </li></ul><ul><li>E. P2 </li></ul>
  10. 10. Question 9 <ul><li>In which kind of cross would you expect to find a ratio of 3:1 among the F2 offspring? </li></ul><ul><li>A. test cross </li></ul><ul><li>B. dihybrid cross </li></ul><ul><li>C. monohybrid cross </li></ul><ul><li>D. phenotypic cross </li></ul><ul><li>E. genotypic cross </li></ul>
  11. 11. Question 10 <ul><li>Mendel’s law of segregation implies that the two members of an allelic pair: </li></ul><ul><li>A. are distributed to separate gametes </li></ul><ul><li>B. are distributed to the same gamete </li></ul><ul><li>C. are assorted dependently </li></ul><ul><li>D. are segregated pair wise </li></ul><ul><li>E. must always code for the identical trait or feature </li></ul>
  12. 12. Question 11 <ul><li>Which is not true according to Mendel's law of segregation? </li></ul><ul><li>A. each individual contains two factors for each trait </li></ul><ul><li>B. one factor must be dominant and one factor recessive in each individual </li></ul><ul><li>C. factors separate from each other during gamete formation </li></ul><ul><li>D. each gamete contains one copy of each factor </li></ul><ul><li>E. fertilization restores the presence of two factors </li></ul>
  13. 13. Question 12 <ul><li>What are alleles? </li></ul><ul><li>A. genes for different traits, such as hair color and eye color </li></ul><ul><li>B. dominant forms of a kind of characteristic carried by genes </li></ul><ul><li>C. the locations of genes on chromosomes </li></ul><ul><li>D. alternative forms of a gene for a single trait, such as blue eyes and brown eyes </li></ul><ul><li>E. recessive forms of a kind of characteristic carried by genes </li></ul>
  14. 14. Question 13 <ul><li>Which of the following terms is represented by word descriptions, such as brown or tall? </li></ul><ul><li>A. phenotype </li></ul><ul><li>B. genotype </li></ul><ul><li>C. allele </li></ul><ul><li>D. homozygous </li></ul><ul><li>E. dominance </li></ul>
  15. 15. Question 14 <ul><li>In humans, brown eyes (B) are dominant over blue eyes (b). A brown-eyed woman who has a blue-eyed child would have the genotype: </li></ul><ul><li>A. bb </li></ul><ul><li>B. Bb </li></ul><ul><li>C. BB </li></ul><ul><li>D. BBB </li></ul><ul><li>E. BbBb </li></ul>
  16. 16. Question 15 <ul><li>When an organism has two identical alleles for a trait we would refer to this condition as: </li></ul><ul><li>A. phenotype </li></ul><ul><li>B. genotype </li></ul><ul><li>C. homozygous </li></ul><ul><li>D. gene locus </li></ul><ul><li>E. heterozygous </li></ul>
  17. 17. Question 16 <ul><li>When an organism has two different alleles for a particular trait, which of the following terms best describes this condition? </li></ul><ul><li>A. phenotype </li></ul><ul><li>B. genotype </li></ul><ul><li>C. homozygous </li></ul><ul><li>D. gene locus </li></ul><ul><li>E. heterozygous </li></ul>
  18. 18. Question 17 <ul><li>Which of the following terms would be used for an allele which can mask the expression of another allele? </li></ul><ul><li>A. dominant </li></ul><ul><li>B. phenotype </li></ul><ul><li>C. recessive </li></ul><ul><li>D. genotype </li></ul><ul><li>E. locus </li></ul>
  19. 19. Question 18 <ul><li>If a homozygous brown-eyed woman mates with a homozygous blue-eyed man, what would be the chances of producing a blue-eyed child? </li></ul><ul><li>A. 100% </li></ul><ul><li>B. 75% </li></ul><ul><li>C. 50% </li></ul><ul><li>D. 25% </li></ul><ul><li>E. 0% </li></ul>
  20. 20. Question 19 <ul><li>A woman who can roll her tongue (presumably dominant) is married to a man who cannot. Two of their four children can roll their tongues and two cannot. What is the genotype of the parents? </li></ul><ul><li>A. woman Aa, man Aa </li></ul><ul><li>B. woman AA, man aa </li></ul><ul><li>C. woman Aa, man AA </li></ul><ul><li>D. woman Aa, man aa </li></ul><ul><li>E. cannot be determined </li></ul>
  21. 21. Question 20 <ul><li>If an organism shows a recessive phenotype, such as short pea plants, it can be: </li></ul><ul><li>A. either TT or Tt </li></ul><ul><li>B. either TT or tt </li></ul><ul><li>C. only tt </li></ul><ul><li>D. only TT </li></ul><ul><li>E. only Tt </li></ul>