There are some concepts in biology that are best learned and understood by problem-solving. One such concept is the Hardy-Weinberg equilibrium, which stated that allele and genotype frequencies within a population will remain constant from generation to generation unless some external influences act directly on those alleles or genotypes.Here, geneticist Kevin O'Dell takes you on an imaginary journey to fictiitious Scottish Island of Eilean nan Caorach Geala (White Sheep Island).