Yield stability is an important and sometimes difficult trait to integrate into a good breeding line. The mechanisms of stability are not completely understood. Lerner theorized that a population found in its natural reproductive state would have maximum stability through natural selection for maximum fitness while deviations from this state will decrease stability. On the contrary, it is also theorized that increasing variation, either inter or intra genically, will increase stability. We produced four populations to test these theories, possibly providing a more complete understanding of stability and are as follows: I. Homozygous-Homogeneous: Pure lines grown in pure stands. II. Heterozygous-Homogeneous: F1 lines grown in pure stands. III. Homozygous-Heterogeneous: Pure lines grown in blended stands. IV. Heterozygous-Heterogeneous: F1 lines grown in blended stands. Stability of each population was established on lint yield per se without trying to identify the best cultivar by stability combination. Differences were determined using the coefficient of variation. Heterozygosity was found to positively influence yield stability while there was no significant increase in stability found in either heterogeneous populations when compared to their homogeneous counterpart.