Nondisjunction of chromosomes may result in
A) the loss of one homologous chromosome pair.
B) the addition of one homologous chromosome pair.
C) the addition of a single chromosome.
D) the loss of a single chromosome.
E) All of these
E
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Genomic analysis of Prochlorococcus has revealed
A) the presence of bacteriorhodopsin. B) variations in ribosomal genes within the same phylotype. C) complete congruence of genes and genome structure within the same phylotype. D) variation in functional genes within phylotypes, but high levels of gene conservation between cultured representatives and environmental populations.
Ehrlich and Raven proposed an "escape and radiate" hypothesis that predicts that:
A. plants that escape their herbivores will radiate, increasing diversity. B. plants that are not eaten will develop more similar traits. C. plants and insects co-evolve toward less species diversity. D. plants will only win the evolutionary "arms race" if they escape to new habitats. E. plants and insects are showing less diversity through time as each adapts to the other's defenses.
In the wake of the retreat of a glacier, leaving bare rock and sand, the action of the first colonizing species in this environment to make the area suitable for other species is called
A. secondary succession. B. climax succession. C. seral accumulation. D. facilitation. E. optimal succession.
Which of the following increases the surface area available for gas exchange among various organisms?
A. tubular body shape, as in annelids B. finely divided inner lung surface in mammals C. flattened body, as in planarians D. finely divided gills in fish E. All of these choices increase surface area.