In an experiment to distinguish genetic versus environmental effects on a trait, the test individuals
A) should be as genetically related as possible.
B) should have variable alleles at as many loci as possible.
C) must have the same parents.
D) must be grown in a natural environment.
A) should be as genetically related as possible.
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Mendel's experiments with garden peas differed from those of other plant hybridizers of the time in that:
A. Mendel studied true-breeding strains, rather than poorly defined material. B. Mendel focused on a small number of easily contrasted traits, rather than a large number of more complex traits. C. Mendel quantified his results and looked for statistical patterns, rather than simply noting the presence or absence of a trait among a group of offspring. D. Mendel performed no crosses between strains, whereas other hybridizers did. E. Mendel studied true-breeding strains, focused on a small number of easily contrasted traits, and quantified results.
In what kind of environment are fossils most likely to form?
A. desert B. tropical rainforest C. tundra D. shallow lake bed E. fast flowing creek
Coastal regions where seawater mixes with fresh water from rivers, streams, and runoff are called
____.
a. neritic zones b. estuaries c. benthos d. wetlands e. intertidal zones
Balanced polymorphism is a type of
a. disruptive selection. b. sexual selection. c. directional selection. d. stabilizing selection. e. any of these