_____________ is the primary force responsible for changes in allelic frequency of deleterious mutations. _______________ is the primary force responsible for changes in allelic frequency of neutral mutations
A. Genetic drift; Natural selection
B. Natural selection; Genetic drift
B
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Media in which all components and their concentration are known are called ________ media.
A. defined B. selective C. enrichment D. transport
A mutant of Rhizobium leguminosarum is able to survive and reproduce in the laboratory outside of plant roots, but can no longer initiate root nodule formation. What type of genes are most likely mutated in this mutant?
A) rhz genes B) myc genes C) nif genes D) nod genes
Hydrophobic reactions of phospholipids may produce clusters of their fatty acid tails, which form
a. a lipid bilayer. b. hydrolysis of the fatty acids. c. a protein membrane. d. a cytoskeleton. e. a nonpolar membrane.
Complex phenotypes that are shaped by more than one gene as well as by some aspect of an individual’s environment represent a(n)
1.multifactorial trait. 2.polygenic trait. 3.codominant trait. 4.autosomal trait. 5.recessive trait.