2%
Hairy red straight 15 7.5 14.1%
Hairy white curved 23 12 14.1%
Hairy white straight 17 8.5 4.7%
Smooth red curved 23 12 14.1%
Smooth red straight 9 4.5 4.7%
Smooth white curved 5 2.5 4.7%
Smooth white straight 12 6 1.6%
The agreement is as comprehensive as might be expected from an
experiment with about 200 plants, and there can be no doubt that a
repetition on a larger scale would give still closer agreement.
In the same way we might proceed to crosses with four or more
differentiating characters. But each new character will double the
number of the groups. Four characters will combine into 16 groups, five
into 32, six into 64, seven into 128, etc. Hence it is easily seen that
the size of the experiments must be made larger and larger in the same
ratio, if we intend to expect numbers equally trustworthy. For [305]
seven differentiating marks 16,384 individuals are required for a
complete series. And in this set the group with the seven attributes all
in a latent condition would contain only a single individual.
Unfortunately the practical value of these calculations is not very
great.
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