Stabilizing selection would be present if
A. gene frequencies do not change from one generation to the next.
B. mutations constantly replace the genes lost from one generation to the next.
C. there are no selecting agents.
D. All of these are possible.
A. gene frequencies do not change from one generation to the next.
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The second messenger inositol triphosphate (IP3) appears to be involved in stomatal closure triggered by ____
a. auxins b. abscisic acid c. oligosaccharins d. salicylic acid e. gibberellins
Although carbon dioxide contains carbon, it is
not considered an "organic" compound because a. it is not found in the earth's crust. b. it is not present in living cells. c. the carbon atom is not bonded to at least one hydrogen atom. d. the carbons are not in chains or rings. e. it is too small.
Trisomy 21 is a consequence of _________________, the unequal distribution of chromosomes during meiosis.
a. crossing over b. cytokinesis c. chorionic villus sampling d. recombination e. non disjunction
How is generalized transduction different from specialized transduction?
a. Generalized transduction is initiated by a lysogenic bacteriophage; specialized transduction is initiated by a lytic phage. b. Only one specific host gene is transferred in both specialized transduction and generalized transduction. c. Specialized transduction uses animal viruses instead of bacteriophage. d. Generalized transduction is initiated during lytic cycle of a virulent bacteriophage; specialized transduction is initiated during the lysogenic cycle of a temperate bacteriophage.