Variation that does not alter the ability to survive and reproduce:a
is not possible with natural selection.
b. reduces genetic polymorphism.
c. is only possible for polygenic traits.
d. is not part of the gene pool.
e. is called neutral variation
E
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Which of the following statements characterize euphylls?
_____ They differ from lycophylls by having a single, unbranched vein rather than a branched vascular system. _____ They are believed to have evolved from a branch that flattened and developed photosynthetic tissue between the branches. _____ They are also called microphylls because they tend to be much smaller than lycophylls. _____ They are the leaf-like photosynthetic structures found among bryophytes. _____ They allow increased photosynthetic ability when compared to lycophylls.
Small ribonucleoprotein particles (snRNPs) are involved in ____
a. mRNA splicing b. initiation of transcription c. aminoacylation of tRNA d. initiation of translation e. termination of translation
The following nutrient most associated with
eutrophication is: a. iron. b. hydrogen. c. oxygen. d. carbon. e. phosphate.
Which of the following results in a spontaneous mutation?
A. exposure to ultraviolet light and benzo (a)-pyrene B. exposure to X-rays C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke D. exposure to ultraviolet light E. free radicals produced by cellular metabolism