Inheritance of Characteristics in Domestic Fowl
by Charles Benedict Davenport (1866–1944)
- Free to read
- 4 hours to read
- 13 chapters
- Reading level: 7th grade
"Inheritance of Characteristics in Domestic Fowl" by Charles Benedict Davenport is a scientific publication written in the early 20th century. This work explores the inheritance patterns and characteristics of domestic fowl through detailed studies, focusing particularly on traits such as comb shape and feather color. Davenport’s research contributes to the understanding of genetic inheritance and variability in poultry breeds. The opening of the text introduces the foundation of the studies presented, emphasizing concepts of dominance and inheritance related to specific traits in domestic fowl. Davenport discusses the Y comb as an illustration of genetic variability and inheritance patterns, explaining how different types of comb structures arise from parental crosses. He elaborates on the variability observed in offspring and the influence of dominant and recessive traits, ultimately setting the stage for deeper investigations into polydactylism and other inherited characteristics of fowl.
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Chapter I
THE SPLIT OR Y COMB.
A. INTERPRETATION OF THE Y COMB.
When a bird with a single comb, which may be conveniently symbolized as I, is crossed with a bird with a "V" comb such as is seen in the Polish race, and may be symbolized as oo, the product is a split or Y comb. This Y comb is a new form. As we do not expect new forms to appear in hybridization, the question arises, How is this Y comb to be interpreted? Three interpretations seem possible. According to one, the antagonistic characters (allelomorphs) are I comb and oo comb, and in the product neither is recessive, but both dominant. The result is a case of particulate inheritance—the single comb being inherited anteriorly and the oo comb posteriorly. On this interpretation the result is not at all Mendelian.
According to the second interpretation the hereditary units are not what appear on the surface, but each type of comb contains two factors, of which (in each case) one is positive and the other negative. In the case of the I comb the factors are presence of median element and absence of lateral or paired element; and in the case of the oo comb the factors are absence of median element and presence of lateral element. On this hypothesis the two positive factors are dominant and the two negative factors are recessive.
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About this edition
This free edition of Inheritance of Characteristics in Domestic Fowl by Charles Benedict Davenport comes from Project Gutenberg eBook #48288, released 2015-02-17. It is in the public domain in the United States, so you can read it here in full at no cost, on any phone, tablet or computer. Genre: Science - Biology.
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