[Darren Abbey]

Backcrossing an F1 to the domestic parent is an effective way to transfer over dominant traits from the wildling into the domesticated line.

P1 x P2 => F1 x P1 => BC1 x P1 => BC2 x P1 => BC3 ... etc.

After several generations, you will end up with a line that is essentially the same as the chosen backcross parent, but with the selected dominant traits from the the other parent.

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The case for transferring a recessive trait is move involved.

P1 x P2 => F1 x F1 => F2 x P1 => BC1 x BC1 => BC1:F2 x P1 => BC2 x BC2 => BC2:F2 x P1 => BC3 ... etc.

In each F2 generation, you'd need to grow out enough plants to recover the double-recessive case for the traits of interest. If you don't, then you can easily lose the recessive trait at any stage in the backcross series.

The recessive case takes roughly twice the number of generations as the dominant case, because of the need to check all the time that you haven't lost the recessive traits. If you're lucky, you can identify the "recessive" trait by some subtle effect in the heterozygous condition and then the process will be like the dominant case.