Quantitative traits typically have multiple genetic influences in which alleles of a number of genes contribute individual amounts to the final phenotype without classical dominance or epistasis
The term used for the observed variation that results from this is A) VA.
B) VD.
C) VE.
D) VG.
E) VI.
A
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Most land-dwelling invertebrates and all of the amphibians _____
A) are ectothermic organisms with variable body temperatures B) alter their metabolic rates to maintain a constant body temperature of 37 °C C) have a net loss of heat across a moist body surface, even in direct sun D) are endotherms but become thermoconformers when they are in water E) become more active when environmental temperatures drop below 15 °C
The eye generally has a large percentage of normal biota present.
Answer the following statement true (T) or false (F)
Ecologist James H. Brown of the University of New Mexico has addressed species composition and richness in
experiments conducted since 1977 in the Chihuahuan desert of southeastern Arizona. In one experiment, the removal of three dominant species, all kangaroo rats, from several plots resulted in an increased diversity of other rodent species. This increase was ascribed both to lowered competition for food and also to an altered habitat, because the abundance of grass species ____ after the removal of the kangaroo rats. a. increased b. decreased c. did not change d. was threatened e. shrunk
The atomic number of an atom is defined as the
A) number of neutrons in the atomic nucleus. B) total number of electrons and neutrons. C) total number of energy shells. D) number of protons in the atomic nucleus. E) number of electrons in the outermost energy level.