BIOL 2316 Test Bank for Chapter 5: Extensions and Modifications of Basic Principles

The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of inheritance does this demonstrate for flower color in these plants? a. Complete dominance b. Incomplete dominance c. Codominance d. Complementation e. Lethal alleles Answer: b Section 5.1 Comprehension 2. Interactions among the human ABO blood group alleles involve _______ and ________. a. co-dominance; complete dominance b. codominance; incomplete dominance c. complete dominance; incomplete dominance d. epistasis; complementation e. continuous variation; environmental variation Answer: a Section 5.1 Comprehension 3. In the endangered African watchamakallit, the offspring of a true-breeding black parent and a true-breeding white parent are all gray. When the gray offspring are crossed among themselves, their offspring occur in a ratio of 1 black:2 gray:1 white. Upon close examination of the coats, each hair of a gray animal is gray. What is the mode of inheritance? a. One gene pair with black dominant to white b. One gene pair with codominance c. One gene pair with incomplete dominance d. Two gene pairs with recessive epistasis e. Two gene pairs with duplicate genes Answer: c Section 5.1 Comprehension