Which of the following is the best example of a trait with a flat reaction norm?
a. percent lean mass in cattle
b. human height
c. round vs wrinkled seed surface in plants
d. susceptibility to type II diabetes
c. round vs wrinkled seed surface in plants
xplanation:
If the Norm of Reaction is flat, the phenotype produced over the entire range of environments is constant. This corresponds to what we usually think of as a "genetic": a particular genotype always produces exactly the same phenotype irrespective of environment.
lassic single-gene traits fall into this category: peas are round (RR, Rr) or wrinkled (rr) according to genotype, irrespective of environment
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