When you plant seeds of the same strain the plants can lean more towards 1 of the parent plants or is a mix of the parent plants. Just like children from aren't identical to their parents (unless we cloned them then they are not really children). Each seed expresses certain traits or qualities of the parents and this expression is the "phenotype". Some strains are more stable than others in that all the seeds popped will be similar phenos.Sorry i might seem like an amateur on the subject but what do you mean by pheno?