Findings of Morgan in chicken: are they real?
Journal Title: Animal Biology & Animal Husbandry - International Journal of the Bioflux Society - Year 2009, Vol 1, Issue 2
Abstract
The genetic sex determination of Gallinaceae was explained in literature on the chromosomal level by the existence of the male sex, homogametic ZZ, and of the female sex, heterogametic ZW, as well as by the existence of genes within the chromosome Z and by the absence of genes within the chromosome W (Morgan 1919). In this paper we present the experimental results of direct and reciprocal genetic recombination. The experimental design allows the identification of the dominant sex gene linked to the gene that determines the plumage color in the first generation females. Both these genes are located within the chromosome W. In the same generation the recessive sex gene was identified within the chromosome Z. The second generation was obtained by cross of the males and females of the first generation. In each category of genotypes of the second generation males and females are displayed equally. Three categories of genotypes were produced, namely dominant homozygous, heterozygous, and recessive homozygous. The experimental results onstrate that within the chromosome W both the dominant sex gene and the gene transmitting the plumage color are located. Our results are not in accordance with the hemizygotic theory of Morgan (1919).
Authors and Affiliations
Florin Pricop
Keywords
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