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Cannabis can be propagated either sexually (pollination) or asexually (by cloning). Seeds are the result of sexual propagation. Because sexual propagation involves the recombination of genetic material from two parents we expect to observe variation among seedlings and offspring with characteristics differing from those of the parents. Vegetative methods of propagation (cloning) such as cutting, layering, or division of roots are asexual and allow exact replication of the parent plant without genetic variation. Asexual propagation, in theory, allows strains to be preserved unchanged through many seasons and hundreds of individuals.