Quote:
Originally Posted by Minnesota Mato
I will be trying this plan shortly, my F1 is starting to blush, I am hoping to find what I'm looking for with 40 plants, that's the most room I have. Just for fun how many plants would I need to grow out in the F2 without any backcrosses to get (gf/gf,R/R,fas,fas)
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Depends on the concentration of those genes in the parents of the cross.
For the worst case scenario, let's assume that one parent provides all of the desired genes, and the other parent doesn't provide any. So with two recessive genes and one dominant the odds of finding the phenotype you are looking for in the F2 are: 1/4 * 1/2 * 1/4 = 1 in 32... However half of plants that match the desired phenotype will only have one copy of the R gene, so the odds are 1:64 that an F2 plant will be homozygous for all the genes of interest. But because the assortment of the genes, and the selection of seeds is random, I figure that you'd need about 320 plants to feel really secure about winning the genetic lottery.