Summary
If no selection is applied on the F2 of a self-fertilizing crop, the effect of random mating F2 plants upon following generations (F′3, F′4, F′5, ... F′i) is scanty:
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i)
F′3 contains less plants with the desired genotype A 1A1B1B1 than the normal F3.
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ii)
F′, contains if the loci segregate independently as many plants with the optimal genotype as F3. When the loci are linked F′, contains at most 25% more plants with the optimal genotype than F,.
When selection takes place in the F2, the effect of random mating plants of the remaining F2 on the F3 is negative and nil where the F, is concerned.
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References
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Bos, I. More arguments against intermating F2 plants of a self-fertilizing crop. Euphytica 26, 33–46 (1977). https://doi.org/10.1007/BF00032066
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DOI: https://doi.org/10.1007/BF00032066