People get all confused with genetics. I try to simplify it with a dog analogy. If you take two poodles, you 99.9999% of the time get regular poodle puppies (barring genetic mutations like an albino poodle) but each poodle is unique, but still obviously a poodle. If you cut the tail of a specific poodle and clone it...they are genetically identical, but two different dogs now. If you take both of these poodles and breed one with a labrador and the other with a chihuahua, you get lots of really wierd puppies. Until you do it selectively enough times and you eventually get two distinct new breeds, labra-doodle (yes that's real) and a miniature poodle. Which you could breed with some certainty. With weed, each seed is a unique genotype of a specific phenotype (arrrrg! High school biology!) two gorilla glue seeds share a majority of the same traits, expressed differently. But if you take a cut of gorilla glue #4... It's #4 every time.