Saving hybrid seeds

Make s1 of your hybrid, those seeds will be similar.
 
an F1 cross will usually throw out a uniform growth and pheno range....breed them with each other to get F2's and usually that is when you begin to get the wide ranging variations of the original parental strains...it takes successive interbreeding of the F2 through to F8 generations [with the culling and choosing process] to get a stable genetic line going IMO and IME...

TLBWP
 
The above said some F1 characteristics may be a co-dominate expression--it takes one chromosome from each parent in the pair of chromosomes, these characteristics will not stabilize. But when all your genetic mixing is just to produce 1 trait and the trait is co-dom 50 % of the F2s will be showing it.
 
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