LUTHER BURBANK 
and that the individuals in question will all bear 
Jarge fruit. 
So we may expect (on this assumption), having 
grafted our selected seedlings, that each of them 
will show, two or three years hence, fruit of large 
size. 
But of course the other qualities of this fruit 
will not be all that we could desire, so it will be 
necessary to continue the experiment. 
Suppose we do this by cross-pollenizing differ- 
ent members of the same group. We shall thus 
mate Bb with Bb. And the result of this mating, 
as we know, will be to produce, in each group of 
four, one BB individual, two Bb individuals, and 
one bb individual. Being interpreted in terms of 
our actual row of seedlings, as they stand in our 
orchard in this, the fourth or fifth year of our ex- 
periment, this means that in every lot of four. 
thousand seedlings one thousand are pure domi- 
nants as regards large fruit, two thousand are 
mixed dominants, and one thousand are pure re- 
cessives. 
But now comes a very tangible and very prac- 
tical complication. As regards their external 
traits, and as regards the fruit that they will indi- 
vidually bear, the one thousand pure dominants 
(BB) and the two thousand mixed dominants (Bb) 
are identical. There is nothing in their exterior 
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