We are currently analyzing a series of experiments intended to elucidate the
genetic architecture of brain size in chickens. The data sets are comprised
of 4 diallel crosses made up of related and unrelated
populations of chickens (3, 4 and 5 parental stocks with brain and body
weights measured at hatch through 84 days of age in both sexes).
During analysis of the data, using both the Griffing and Eberhart and Gardner
models (similar to Gene Eisen's work in mice), we also performed the
'traditional' Hayman's analysis (similar to Norm Henderson's work, also in
mice). We have found evidence for significant dominance for brain size using
both types of analysis.
Curiously, we have observed that the expression of dominance differs between
males and females. females tend to exhibit sig. dominance variation at early
ages which diminishes over time, while males exhibit increasing dominance at
Does anyone have any thoughts regarding possible genetic or evolutionary
explanations of differential expression of dominance between the sexes??
please respond to me or to Gillian Leach (grl104 at email.psu.edu)
//// G. F. Barbato Phone: (814)-865-4481
< * ) Dept. Poultry Science FAX: (814)-865-5691
\ \__/// Penn State University Lab: (814)-865-3189
( --- ) University Park, PA 16802 Email: gfb1 at psu.edu
\/ \/ **** URL: http://ps235.cas.psu.edu/ ****
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-------- B.F. Skinner