Two Further Notes on the Origin of Dominance

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Abstract
(1) A cotton mutant, Crinkled Dwarf, is completely recessive in the Sea Island group of cottons in which it is known to occur; when introduced into other species, in which it does not occur naturally, dominance is no longer complete. The Sea Island group apparently differs from other New World cottons in a number of modifiers which together function to render the mutant recessive. (2) The group of non-lethal dominants found in domesticated breeds of poultry may owe their dominance to prolonged human selection in circumstances in which domestic flocks are frequently sired by wild birds. If this is the true explanation, dominance should be found to be incomplete when these genes are introduced into wild stock.

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