Tested Studies in Laboratory Teaching, 1991, Volume 12
Abstract
Students have difficulty imagining how the genotype, operating at the primary level of organization to produce a polypeptide, can effect higher order phenotypic expression. One reason for the difficulty is that hierarchial complexity of cell, tissue, and organ system interaction is skirted when a genotype is correlated to a complex trait (as, for example, R = round, r = wrinkled). This exercise explores the biological basis for a classic genetic trait, round versus wrinkled peas, by investigating the multiple (pleiotropic) effects that the gene product, starch branching enzyme, has on metabolism, shape of the starch grain, and osmotic potential.
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