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    Proc Biol Sci. 1990 Aug 22;241(1301):146-52.

    Lack of response to family selection for directional asymmetry in Drosophila melanogaster: left and right are not distinguished in development.

    Tuinstra EJ, De Jong G, Scharloo W.

    Source

    University of Utrecht, The Netherlands.

    Abstract

    Family selection for directional asymmetry in the expression of the Drosophila melanogaster mutant scute had no result. Fluctuating asymmetry did not show a selection differential correlated with directional asymmetry. The unfolding of bilateral symmetry in embryogenesis can be used to explain the lack of genetic variation for directional asymmetry. Directional asymmetry provides a well-understood example of a developmental constraint in evolution. It is proposed that as no evidence is available for an independent left-right gradient in the embryo, quantitative traits can only be expressed variably along an existing gradient of positional information or a morphogen.

    PMID:
    1978341
    [PubMed - indexed for MEDLINE]

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