Abstract
Knowledge concerning the genetics of feather color, shank color, and comb type has advanced greatly during the past two decades. Mendel’s law has been found to apply to such characters so that there is available at present a considerable body of data concerning the heredity nature of feather color, shank color, and comb type in most varieties of domestic fowl. On the other hand, the mode of inheritance of such physiological characters as fecundity is very incompletely understood. In this paper attention will be confined entirely to the operation of Mendel’s laws in the inheritance of fecundity.Pearl (1912) is the first genetacist to attack this problem, and, after very careful analysis of available records, to propose a theory to explain the inheritance of winter fecundity in Barred Plymouth Rocks. His L1 L2 theory is so familiar to most poultry workers that little explanation is necessary here. Suffice it to say .
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