Page:Popular Science Monthly Volume 79.djvu/461

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457

MATHEMATICS AND ENGINEERING IN NATURE

Fig. 7.

of their respective numbers is generally 3 to 1. To explain this fact, first observed by Mendel, the hypothesis is made that in crossing the specific sexual elements merely associate and do not form a new uniform individual element. Among the G- and W- elements, in equal numbers, the following combinations are possible during the act of generation:

G and G,
G and W,
W and G,
W and W.

Fig. 8.

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