Assume that the length of a type of cucumber at maturity is controlled by three genes (A, B, and C), each of which has two alleles. The A, B, and C alleles each add 2 inches of cucumber growth, while the a, b, and c alleles add only 1 inch
A true-breeding 6-inch strain is bred to a true-breeding 12-inch strain. All the F1s produce 9-inch cucumbers. What sizes would you expect to see in the mature F2s? A) Discrete lengths of 6, 9, and 12 inches
B) Discrete lengths of 6 and 12 inches
C) Discrete lengths of 9 inches
D) Discrete lengths of 6, 7, 8, 9, 10, 11, and 12 inches
E) Lengths ranging continuously from 6 to 12 inches
D
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Indicate whether the statement is true or false.
Working with biosafety Level 3 agents requires:
a. U.S. Department of Agriculture (USDA) credentials and a postgraduate degree in microbiology or a related field. b. laboratory design features that control air movement. c. personnel to wear protective clothing and devices and enter a decontaminating chamber before leaving. d. workers to have blood samples routinely tested to rule out infection or contamina-tion.
What type of relationship is occurring when one organism feeds on or in another species without immediately killing the host species?
a. predation b. herbivory c. parasitism d. commensalism
Which of the following bacterial arrangements is the result of snapping division?
A) tetrads B) palisades C) strepto- D) sarcinae E) staphylo-