Sex Ratio Manipulation and Selection for Attractiveness

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Science  13 Feb 1981:
Vol. 211, Issue 4483, pp. 721-722
DOI: 10.1126/science.211.4483.721


Laboratory experiments performed on a monogamous estrildid, the zebra finch (Poephila guttata), indicate that sex ratio of offspring is affected by non-genetic markers (colored plastic leg bands) that vary in attractiveness to birds. Results suggest that natural selection favors individuals that produce offspring of the sex of the more attractive parent within a breeding pair.