Since the ovules of each kind are offered both kinds of pollen, half of each, on the average, will be fertilized by one and half by the other kind of pollen, giving the four fertilizations shown at the right. (Abundant experience has shown that S X B=B X S.) From this it appears that one fourth of the progeny of the hybrid Sb will be like the parent B, one fourth like…
— W. J. Spillman
https://palimpseste.vercel.app/#text/92b193bb-0136-4b51-a3c1-a1cee71fbede
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