Abstract
It is suggested that the excess of four-toed fowls frequently found in F1, F2 and backcross following the mating of polydactylous X normal fowls, as observed by Punnett and Pease in their collation of data on polydactyly, may be due to a deficiency in one or both parents of factors necessary for the dominance of polydactyly, rather than to the presence in "resistant" parents of factors inhibiting polydactyly as was suggested by Punnett and Pease.

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