TEST BANK FOR MOLECULAR BIOLOGY PRINCIPLES AND PRACTICE 2ND EDITION COX DOUDNA O’DONNELL

Chapter 2 - Test Bank Questions Section 2.1 1. Mendel’s success in formulating his fundamental principles of inheritance can be attributed to which of the following? A. Mendel focused on the overall appearance of the plant rather than on individual traits. B. Mendel focused on individual traits of the plant rather than on the overall appearance. C. Mendel chose to study complex traits that result from interactions between multiple genes. D. Mendel used an organism that grew slowly, therefore having long generation times. E. Mendel used fruit flies to study inheritance. Ans: B 2. If a pea plant strain is true-breeding for a particular trait then: A. crosses between two true-breeding plants with the same trait will have offspring identical to the parents. B. it will be homozygous for all genes. C. it must be a recessive trait. D. it is not useful for studying inheritance. E. it only self-fertilizes. Ans: A 3. True-breeding, purple-flowered pea plants were crossed with true-breeding, white-flowered pea plants. The F1 progeny all had purple flowers. If the F1 offspring are self-fertilized, what progeny phenotypes would be expected? A. 1 purple : 2 pink : 1 white B. 3 white : 1 purple C. 3 purple : 1 white D. All purple E. All white Ans: C 4. A cross of pea plants both heterozygous for seed shape and color traits, resulted in progeny in the ratio 9/16 round yellow (R_Y_), 3/16 round green (R_ww), 3/16 wrinkled yellow (rrY_), and 1/16 wrinkled green (rrww). This result demonstrates: A. that the alleles responsible for seed color are segregating but those responsible for shape are not. B. that the alleles of two different genes are segregating at the same time independently. C. that the phenotypes corresponding to seed shape are segregating 1:2:1. D. that the alleles governing seed color display codominance. E. More than one of the above result in a true statement. Ans: B