Fomites, food, and air serve as indirect transmission routes of pathogens.
Answer the following statement true (T) or false (F)
True
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Barnacles on the bellies of whales or on the shells of mollusks are examples of:
A. mutualism B. predation C. commensalism D. amensalism E. parasitism
To use a backcross mating strategy for QTL mapping
A. two inbred parental strains that differ in a quantitative trait are crossed are mated B. the F1 offspring are crossed with each other. C. the F2 offspring must contain chromosomes that are recombinant betweeen the markers and the genes involved in the trait D. each parent should contain the same alleles at each QTL.
After obtaining DNA fragments by PCR, the
fragments are
a. separated by a centrifuge. b. viewed under a microscope. c. separated by an electric current. d. inserted into a plasmid. e. chopped up using restriction enzymes
Directional selection favors:
A. one narrow intermediate phenotype. B. two otherwise maladapted phenotype. C. one extreme phenotype. D. two extreme phenotype