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Genet. Res., Camb. (2000), 75, pp. 153166. Printed in the United Kingdom # 2000 Cambridge University Press The genetic structure of female life history in
 

Summary: Genet. Res., Camb. (2000), 75, pp. 153­166. Printed in the United Kingdom # 2000 Cambridge University Press
The genetic structure of female life history in
D. melanogaster: comparisons among populations
153
PHILIP M. SERVICE
Department of Biological Sciences, Northern Arizona Uni ersity, Flagstaff, AZ 86011, USA
(Recei ed 19 January 1999 and in re ised form 16 June 1999)
Summary
Two questions were addressed: (1) What is the genetic variance­covariance structure of a suite of
four female life history traits in D. melanogaster? and (2) Does the genetic architecture of these
traits differ among populations? Three populations of D. melanogaster were studied. Genetic
variances and covariances were estimated by sib analysis three times for each population:
immediately upon establishment of populations in the laboratory, and subsequently after
approximately 6 months and 2 years of laboratory culture. Entire genetic variance­covariance
matrices, as well as their individual components, were compared between populations by means of
likelihood ratio tests. All traits studied were significantly heritable in at least one-half of estimates.
Despite large sample sizes, additive genetic covariances were for the most part not statistically
significant, and only two significant negative covariance estimates were obtained throughout the
experiments. Therefore, these experiments provide little support for evolutionary life history
theories that are based on negative genetic correlations among life history components. Neither do

  

Source: Allan, Gery - Department of Biological Sciences, Northern Arizona University

 

Collections: Biology and Medicine; Environmental Sciences and Ecology