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F1 Seeds: The First Breeding:An F1 seed variety is created by breeding together two pure strains. For example, a tall plant (represented with two dominant genes, AA) is bred with a small plant (represented by the two small recessive genes, aa). Since the resulting plants will each receive one gene from each parent, this will result in offspring with the following genetic make-up: Aa. All four offspring will have the same make-up and therefore, will each be tall plants. The difference from the parent generation in this case is that these will not be pure strains due to the presence of the recessive (short) gene.
F2 Seeds: The Breeding Continues:To create what is known as an F2 strain, the grower will breed two members of the F1 family together. The 'children' that result from this breeding will have the genetic make-up of: AA, Aa, AA, and aa. This is illustrated in the table below:
This means that the F2 seed strain will have three tall plants and one short plant. So, the main difference between the F1 and F2 varieties is the amount of genetic variation and purity of the seed strain.