GENETICS OF LIFE HISTORY IN DROSOPHILA MELANOGASTER. I. SIB ANALYSIS OF ADULT FEMALES

Michael R. Rose ¹ and Brian Charlesworth ¹

¹ School of Biological Sciences, University of Sussex, Falmer, Brighton BN1 9QH, England

A sib analysis of adult life-history characters was performed on about twelve hundred females from a laboratory Drosophila melanogaster population that had been sampled from nature and cultured so as to preserve its genetic variability. The following results were found. There was no detectable trend with age in additive or dominance genetic variances for age-specific fecundity. Environmental variance for age-specific fecundity increased with age. The genetic variance for fecundity characters was primarily additive. The genetic variance for longevity was primarily dominance variance. There were negative genetic correlations between early fecundity and lifespan, as well as between mean egg-laying rate and longevity.

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