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No evidence of sexual selection in a repetition of Bateman’s classic study of Drosophila melanogaster

Patricia Adair Gowaty, Yong-Kyu Kim, and Wyatt W. Anderson
PNAS published ahead of print June 11, 2012 https://doi.org/10.1073/pnas.1207851109
Patricia Adair Gowaty
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Yong-Kyu Kim
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Wyatt W. Anderson
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  1. Contributed by Wyatt W. Anderson, May 11, 2012 (sent for review January 8, 2012)

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Abstract

We are unique in reporting a repetition of Bateman [Bateman AJ (1948) Heredity (Edinb) 2:349–368] using his methods of parentage assignment, which linked sex differences in variance of reproductive success and variance in number of mates in small populations of Drosophila melanogaster. Using offspring phenotypes, we inferred who mated with whom and assigned offspring to parents. Like Bateman, we cultured adults expressing dramatic phenotypes, so that each adult was heterozygous-dominant at its unique marker locus but had only wild-type alleles at all other subjects’ marker loci. Assuming no viability effects of parental markers on offspring, the frequencies of parental phenotypes in offspring follow Mendelian expectations: one-quarter will be double-mutants who inherit the dominant gene from each parent, the offspring from which Bateman counted the number of mates per breeder; half of the offspring must be single mutants inheriting the dominant gene of one parent and the wild-type allele of the other parent; and one-quarter would inherit neither of their parent’s marker mutations. Here we show that inviability of double-mutant offspring biased inferences of mate number and number of offspring on which rest inferences of sex differences in fitness variances. Bateman’s method overestimated subjects with zero mates, underestimated subjects with one or more mates, and produced systematically biased estimates of offspring number by sex. Bateman’s methodology mismeasured fitness variances that are the key variables of sexual selection.

  • genetic parentage
  • monogamy

Footnotes

  • ↵1To whom correspondence may be addressed. E-mail: gowaty{at}eeb.ucla.edu or wyatt{at}uga.edu.
  • Author contributions: P.A.G., Y.-K.K., and W.W.A. designed research; P.A.G. analyzed data; Y.-K.K. supervised technicians who carried out the experiment, and entered observations into computerized records; and P.A.G. wrote the paper.

  • The authors declare no conflict of interest.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1207851109/-/DCSupplemental.

Freely available online through the PNAS open access option.

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Repetition of Bateman’s classic study
Patricia Adair Gowaty, Yong-Kyu Kim, Wyatt W. Anderson
Proceedings of the National Academy of Sciences Jun 2012, 201207851; DOI: 10.1073/pnas.1207851109

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Repetition of Bateman’s classic study
Patricia Adair Gowaty, Yong-Kyu Kim, Wyatt W. Anderson
Proceedings of the National Academy of Sciences Jun 2012, 201207851; DOI: 10.1073/pnas.1207851109
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