1. The answer is: d) Environmental Effects Environmental effects can cause a single genotype to produce a range of potential Phenotypes. 2. The answer is: c) Differ in both mean and variance The Figure represents two distributions that differ in both mean and variance. Solution 1. The answer is: d) Environmental Effects Environmental effects can cause a single genotype to produce a range of potential Phenotypes. 2. The answer is: c) Differ in both mean and variance The Figure represents two distributions that differ in both mean and variance..