Precisely. I can most readily imagine this being done by commercial growers who already have a set of inbred strains and a solid understanding of what alleles are found in each.
Another scenario where it might be useful is if your strain [C] is homozygous for an alternate allele (A') at the gene not found in either strains [A] or [B], then the final progeny would be a mix of AA' and aA'. These would be combinations you could not get if you had simply grown out a F2 population from the original cross.
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